An increasing number of old U.S. citizens are traveling abroad. The U.S. Department of State wants you to be prepared so that you can enjoy your trip. Please consider the following tips as you plan your travel.

Travel Documents.

【小题1】Some countries require that passports be valid for six months after your trip ends and some foreign countries require that U.S. travelers obtain a visa.

【小题2】

A secure way to maintain your emergency contact information is to enroll （登记）with our Smart Traveler Enrolment Program. Your information is stored securely and enables the American Embassy to contact you，your family，or your friends in an emergency according to your wishes.

Health Information.

Health care tops the list of concerns for many old U.S. citizens who are thinking about traveling abroad. Consult with your physician prior to your travel overseas to identify your health care needs at your destination. Research the environmental conditions at your overseas destination that may contribute to your specific health concerns. 【小题3】

Medical Insurance Beyond Medicare.

Medicare，the U.S. government health plan for people aged 65 years and older，does NOT cover health care overseas. 【小题4】 Many companies offer short-term health and emergency assistance policies to cover health care expenses incurred overseas，including emergency services such as medical evacuations（撤离）.

Smart Travel.

【小题5】Be aware that sudden changes in diet and climate can have serious health consequences for the unprepared traveler，no matter your age. At the same time，if you aren't sure about anything，turn to the Internet.

Nowadays many people drive to work. It causes more traffic accidents. As students, how can we do to guarantee our safe？First of all, the traffic rules must be strict obeyed. When we cross streets, wait until the traffic light turn green. Next, don't forget walk on the pavement. Finally, I think it is the danger to us to wear headphones while we're walking or cycling. Since we can't pay enough attention on the traffic around us, an accidents may happen. Taking good care of ourselves and don't let our parents worry about them.

   Do teenagers know how to sleep? If you’re the parent of teens, you might be laughing to yourself. That’s all they know how to do. In truth, teens might not know enough about how to sleep, when to sleep and why.【小题1】 .

Just as we focus on our diets and exercise for health, we need to consider sleep necessary to our mental, physical and psychological health. “Good” sleep is sleep that is long enough to allow your brain to remove the side effects of daytime brain activity. Consistent bed times and wakeup times are the key to keeping our sleep cycles.【小题2】.

Teens are social creatures, and the most attractive social “gathering” place these days is on their digital devices.【小题3】. Ideally, we should avoid blue light for at least half an hour before bed. But social media and homework that requires screen time mean too many kids are powering up their devices when their bodies should be powering down for the night.

【小题4】. Equally contributing to sleep issues are eating too late, taking naps, and failing to get enough exercise. In other words, these people never learned how to sleep.

Over time, poor sleep leads to a decline in mood.【小题5】. Significantly, when I speak to my adult patients who are struggling with sleep issues, nearly all of them say their sleep problems started in high school.

Therefore, I recommend sleep education. Otherwise, we won’t necessarily solve the health, safety and economic issues of sleepy teens.

   Searching for airfares often seems like a game that passengers are bound to lose.

Prices change from day to day, even minute to minute. Looking through various websites for the best deal can be a big challenge. Even when you do book, there’s no guarantee that you are going to get the best price.

“You just don’t know when to pull the trigger. It’s not like buying anything else I can think of,” said George Hobica, founder of Airfarewatchdog. com.

Harriet Levy paid $ 179 for a recent round-trip flight on American Airlines between New York and Fort Lauderdale, Florida. Sitting just one row behind her, Shirley Harrison paid $ 215. A few rows back, Ellis and Dianne Traub paid $ 317 each. There were at least 12 fares on the flight, ranging from $ 169 to $ 360.

“There’s no reason for it,” Harrison said.

Fares can vary significantly in just a few hours. One Delta flight from New York to Los Angeles jumped from $ 755 to $ 1,143 from a Friday to Saturday in late April, and then fell to $ 718 on Sunday.

The flight was one of a dozen the Associated Press（美国联合通讯社）followed over three months for a vacation between July 16 and 22. The number one finding: avoid booking tickets on weekends. It’s the most expensive time to buy.

There’s no way to guarantee the best fare. But before booking, travelers should pay attention to this additional advice:

● Book on Tuesday, Wednesday and Thursday. That’s when airlines most often offer sales.

● Buy in advance, but not too early. The best time is four to six weeks before traveling. In general, prices for any given flight are the highest when tickets are booked eight to ten weeks and two to three weeks in advance.

● Make use of social media. Airlines are giving more benefits like exclusive（专有的）sales to travelers who interact（交流）with them on Twitter and Facebook. Those specials are often gone within hours.

● The so-called discount airlines — JetBlue, Air-Tran, Southwest and Frontier — adjust their fares less frequently than other airlines, so you can feel more confident that the price will stay the same. But their prices aren’t always the lowest. Researching multiple airlines’ fares is the only way to get a good deal.

   Many people would like to change various things in their life in order to be more eco-friendly. 【小题1】 They range from changing their jobs to their vehicles and even their homes. In what follows, I am going to talk about the most energy-efficient（节能的）small green homes. Keep on reading, as this article is very useful if you would like to change your home into a more eco-friendly one.

【小题2】 This happens because a green home will contain green devices（设备）which need alternative sources of energy such as solar power and wind power. They do not pollute the atmosphere as much as the regular sources of energy. 【小题3】 The process of installing them is kind of expensive but in the long term, it will save you a lot of money.

【小题4】 It will be made out of recyclable and renewable materials. For example, the furniture will be made out of bamboo instead of materials which take years to grow. This means that there is not a risk of them to be used up as in the case of certain types of wood or other materials.

A green house will be decorated by using non-toxic（无毒的）materials. 【小题5】 They contain harmful chemicals which can be dangerous, but the most energy-efficient small green homes do not have this problem.