Facebook and Twitter are just two of my favorite things. These websites help me keep in touch with my friends and family, find out what 【小题1】 (interest) events are going on and see and share photographs within my social circle. However, the more time I 【小题2】 (spend) online the less sleep I got, and the 【小题3】 (bad) I felt. I was tired and in low spirits, and 【小题4】 (focus) on classroom lectures and activities became 【小题5】 (increasing) difficult.

I began to wonder whether or not there could be a relationship between the hours I spent on the screen and the bad effects it had the next day at school. 【小题6】(answer) my question, I made some research. I surveyed local middle and high school students. Eight hours is 【小题7】 recommended (建议的) amount of sleep for teenagers. From the responses, I found that those who slept for less than eight hours had about three hours of screen time per day, 【小题8】 kids who got more than eight hours of sleep had about two hours of screen time. The kids who slept less were more likely to suffer 【小题9】 stress, sleeplessness and anxiety. They performed poorly in tests and showed more mood 【小题10】 (problem).

   In the United States a voluntary organization called Musician Corps is making a difference in people's lives. Five years ago，Kiff Gallagher，the founder of the organization，realized that music and public services could be used together to help Americans in need. Recognizing that music has a positive effect on Alzheimer's disease and autism（自闭症），he had the idea of creating Musician Corps.

Musician Corps looks for musicians and trains them as teachers. Then the musicians provide these services in city schools，children's hospitals，and assisted-living homes for older adults. They also help organize community concerts. Anyone can play music at these community activities.

Kiff Gallagher says what makes Musician Corps different from other charity organizations is that everybody can take part. It provides a place for people to get involved. He remembers a Musician Corps event at a hospital. Afterwards，he says，the patients are less depressed.

David Meletiche, one of 200 musicians in Musician Corps, teaches an after-school guitar class in a high-crime neighborhood. He is excited that the group gives him not only a job in a difficult economy but also the chance to use the team-building skills he gained in college.

There are 12 high school students in his class. Selena Makwan, one of them who are learning to play the guitar, says the program keeps her busy.“It definitely keeps me off the streets, because without this program I probably would be wandering around right now and I would not know what to do. And it also gives me an opportunity to learn something I've never done before.”

Musician Corps has established programs in California and North Carolina. Kiff Gallagher hopes Musician Corps will continue to expand across America.

Disadvantages of the Cell Phone

There is more than one advantage and disadvantage of cell phones. Anyone considering purchasing their first cell phone, or considering getting rid of their cell phone, should look at the device from different angles. Surely there are disadvantages of buying cell phones. 【小题1】.

Added Costs

【小题2】. First, you will have to purchase a cell phone. While you may find a free phone option with your new wireless plan, smartphone devices can cost as much as $400 or more. Then you will have to pay a monthly fee for service. Service plans vary and can include costs for minutes, text messages, data, and insurance.

【小题3】.

Every time you have your cell phone with you, it could ring and interrupt what you are doing. While it is convenient to keep your phone with you when you are away from home, it also leaves you open to calls from your mother, your boss, or anyone that knows your phone number. This may lead some people to feel like they have less privacy than before.

Less Reliable than a Landline Telephone

【小题4】. This means a cell phone,' no matter how reliable, is not going to work everywhere unlike a landline telephone, which provides service that is more reliable.

Higher Possibility of Accidents

If you are talking or texting on your cell phone while you are driving, you are far more likely to be involved in a car accident. 【小题5】. And despite several recently imposed （强制实行的） laws banning cell phone use while people are driving, many find them almost impossible to carry out.

   Andrew Carnegie once said，"No man can become rich without himself enriching others. The man who dies rich dies disgraced." Many successful businessmen think about sharing and giving back to their community at some point in their lives，and take part in philanthropy（慈善行为）.Some say it is out of generosity，and others believe that it is for tax reasons. One way or another，the money spent for charitable purposes is needed and has some type of impact on someone's life. The following businessmen believe that sharing is caring. They have donated（捐赠）a combined amount of $ 106.8 billion according to research firm Wealth-X.

German Dietmar Hopp co-founded SAP AG，the famous software company. Through his foundation called Dietmar-Hopp-Stiftung，he donated a total of $1 billion to support local education，sports，and health causes in his hometown in Germany. He is worth $ 6.3 billion.

Pierre Omidyar，the French-born Iranian- American businessman is the founder of eBay. In 1998，he started the Omidyar Foundation with his wife. The organization donates to several areas，food，technology and energy etc. In 2015，Omidyar reportedly donated $ 270 million worth of his eBay shares to undisclosed（未公开的）charity. So far，he has given away $ 1 billion or so.

The chairman and CEO of the computer manufacturer，Dell，likes to support education，social and human services，the arts and culture，and community development causes. According to Wealth-X，his lifetime donations are about $ 1.1 billion. His foundation promised to donate $ 25 million to build a 211-bed hospital in Austin，Texas.

James Simons is the chairman of Renaissance Technologies, a very successful firm that owns $ 65billion. With his wife Marilyn, he opened the Simons Foundation, which primarily supports educational causes. They have also opened two other organizations in memory of their two sons who died in 1996 and in 2003: the Paul Simons Foundation and the Nick Simons Foundation. Altogether, the Simons couple have made $ 1.2 billion worth of donations.