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We all need physical exercise. Exercise uses up food we eat and keeps the body full of energy. It works your muscles and makes your heart work hard so as to send blood to your muscles. So, exercise makes your heart and muscles strong. Exercise also makes you feel refreshed. If you exercise a couple of times a week, you will stay happy and healthy.
Some Western countries, such as the United States, have problems with exercise. In the US, many people don’t have enough exercise because it is hard for them. People have to work from dawn till dusk, so they don’t have time to take exercise. They work in office buildings sitting in chairs all day long in front of computers. They cannot get much exercise sitting at desk passively.
Some Westerners can get exercise walking from their homes to work. However, the majority of people cannot do this. It is too far from their homes to their offices. They have no choice but to drive to work. In fact, some have to drive one or two hours to their offices. This is unfavourable in two ways. First, these people don’t have a chance to exercise because they are sitting in their cars for two to four hours each day. Second, driving is challenging especially in rush hours and calls for too much attention. It makes a person worn out. So, when these people arrive home at night, they don’t have the desire to take exercise after work.
Today, many people in the West are overweight, which causes health problems for them. Doctors say exercise can help people both lose weight and improve their health. So many people are trying to get more exercise. But it takes time to change, and when people don’t see a difference right away, they will lose heart and stop exercising.

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When young children are learning to ride a bicycle, they require that their parents hold on to the back of the bike so that they gain confidence and won’t fall off.
However, when children leave to go to college, or get married, parents must accept that their children are riding off into their own future. At this time, parents shouldn’t stand back and with the children gone, they are left with an empty nest. How can parents get through this period of life?
The first thing you should do is nothing at all. You should actually take some time to rest since your child was born. Just relax and reward yourself for the work you put into your child.
Taking some time for yourself will allow you to adjust to the change and figure out how you really feel about your child’s departure (离开). You shouldn’t compare how you feel with how other people feel, as everyone’s experience of an empty nest is different.
Exercise is a great mood lifter. A physical fitness program may have been one of the first sacrifices (牺牲) you made when your child came along; now, with fewer duties, you’ll have time to hit the gym regularly. If you have a friend who also has become an empty nester recently, you may have found a new companion. Not only will you get the chance to share dealing with tips, you’ll also create social opportunities for yourself, which will get you out of that empty house if you need to.
We all have those things that we say we’ll do or learn “someday”. If you’re an empty nester, the “someday” might just be now.
If you’re not sure exactly what to do in all your spare time, take your time and think about it. It will, however, probably be easier to figure out your dream when you’re out. Try exploring a nearby museum or attraction you’ve never visited.
Many parents may fear an empty nest because they worry that their little birds have flown away forever. Try setting up a regular phone date with your child. A once-a-week call may make you feel satisfied while giving your child a reasonable degree of freedom.

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Frederick M. Hess is the director of education policy studies in American. He says that a long summer vacation doesn't make sense in today's world.
In a summer vacation, millions of kids spend valuable time sending messages, watching TV, playing video games and doing shopping in the mall. These activities are putting their futures at risk.
Summer vacation once made sense in the past when you didn't need an education to get a good job. But now things have changed. For today's students, academic(学术的) skills are important to students' future success, but such skills are affected in the summertime. Most American schools offer up to thirteen weeks summer vacation.
Summer vacation also causes challenges for today's families. In the 1960s, more than 60% of families had a stay-at-home Mom. Now two-thirds of American children live in households where every adult works. For these families, summer vacation can be more burden than break. Someone must watch the kids.
“A longer school year does not have to be hard and boring work. Instead, it should allow teachers to give richer and more imaginative lessons,” Frederick M. Hess suggested, “Schools would have more time to devote to athletics, languages, music and the arts”.
Summer vacation can be a grand thing. But in the 21st century, it may also be outdated.
Title: Long Summer Vacation

注意：1. 每处错误及其修改均仅限一词。
2. 只允许修改10处，多者(从11处起)不计分。

注意：1，每处错误及其修改均仅限一词；
2，只允许修改10处，多者（从第11处起）不计分
Dear Mary,
I receive your E-mail just now. Don’t worry about me. I’m getting on well with my research work in the lab. But to my greatly surprise you say you will give up learn English. The reason is because you have not done well in it recently and you have lost interests. I’m afraid I couldn’t agree with you . I know it is difficulty to learn English, and English is widely used in the world today. It will be important tool in our future work. Beside, it is becoming more and more important in our daily life. If you study hard, you will be succeed. Do remember that where there is a will, there is a way. I’ m looking forward to hearing good news from you.
Yours,
Li Hua