Some people think that they will get ill if they will use their brains too much. It is not truly. Through many studies，scientists show us that the less you use your brains，the better they will be，but the cleverer you will become. Of course，if you want to keep your mind clear and active，you must take proper rest and study properly. To the teenagers，use their brains in the morning is good for your health.

There are various ways to rest. One of them is a peaceful rest. Sleep is a perfect example. As we all know，lack of sleep can do great damage for our health. Another is an active rest. For example，take a walk outdoors，and do more exercises every day. In everyday life，eating some eggs，meat，fresh vegetables and fruit are also good for the brains.

   Life can be a lonely thing without friends. Acquaintances（熟人）are easy to come by but true friends are a whole other story. 【小题1】 Learn these four steps if you'd like to be a true friend that can be relied on.

●Be present for their highs and lows.

If you're absent during my struggle，don't expect to be present during my success.

—Will Smith

It's easy to be there for our friends when they ask us out for fun things. 【小题2】 You might not feel comfortable while spending time with an emotionally weak person on the verge of tears，but true friends are always there when they're needed the most.

●【小题3】

When people talk，listen completely. Most people never listen.

—Ernest Hemingway

Give your friends the gift of silence so they can drop their baggage and get on with living.

●Accept them as they are.

Happiness can exist only in acceptance.  

—George Orwell

If you can't accept people as they are，you will never know the feeling of true friendship. 【小题4】

●Forgive the past.

Holding onto anger is like drinking poison and expecting the other person to die.     

—Buddha

【小题5】 If so，you should understand that even the best of us suffer from the occasional slip of the tongue. Holding onto anger over a small mistake will make you look petty（小气的），so let it go.

   With an improved economy，many travelers have been buying first or business class seats，leaving fewer for upgrades（升级）.Here are some strategies for getting a free upgrade.

1. Fly a lot.

This is the most common way to earn a free upgrade. Most airlines reserve some spaces for travelers who fly at least 5，000 miles per year. Five years ago，this meant half or more of domestic（国内的）first class travelers sat up front for free. But now，airlines are selling more high-price seats，so on popular routes it is not unusual for more than 20 travelers to compete for one or two upgrades. But on routes with fewer business class travelers，free upgrades remain more plentiful.

2. Use miles.

If you're not a frequent traveler but still have some miles to fly，you may be able to use them for an upgrade. Be careful，though，as many airlines now ask not just for miles but also a cash co-pay. One example: on flights to Europe，American Airlines charges 5，000 miles，plus $110，for a one-way upgrade from discounted economy class to business class. For most domestic upgrades，American Airlines wants 15，000 miles plus $ 75.

3. Get lucky.

Sometimes airlines overbook coach（经济舱），and a few travelers get no seats. Agents try to ensure the airline's most loyal travelers get the nod（被选中）. Agents usually have some flexibility to make sure the plane is full and takes off on time. So it's the easiest way for them to do it-they might upgrade someone else out of order.

4. Save a life.

Flight attendants don't usually upgrade passengers, even when empty seats remain. Doctors and nurses who answer an emergency call are sometimes an exception. If they comfort a passenger, flight attendants might allow them to sit in business or first class for the rest of the flight.

Yours,

Li Hua