Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 31 to 35.

In the modern word, people are always looking for more ways of keeping fit and staying healthy. The following are some ways to help you become healthy.

Running is excellent exercise. Before you begin running you should warm up first by using slow movements that make all your muscles work. But be careful! If you stretch when your muscles are cold, you might hurt yourself. Always wear comfortable clothing and make sure your trainers are in good shape. If you wear shoes that support your whole foot well, you will put less pressure on your knees. You should start exercising slowly, at a pace you can keep up for about 15 minutes. Try to exercise on soft ground, as this will protect your knees and hips from too much stress.

It's OK if you sometimes go to bed late but if you usually cut down on your sleep, it will soon have a negative effect on your skin. If you get a good night's rest, it will do you the world of gooD.Lack of sleep can cause acne or dry skin. Make sure that you get a good night's sleep by going to bed and getting up at regular times: don't burn the candle at both ends. During the day, keep active: if you don't get enough exercise during the day, you may end up sleepless all night.

Most of us live in big polluted cities. If you got more fresh air, you would look healthier and more attractive. A brisk walk is one of the best things you can do for circulation and appearance. Walking slowly is useful but a quick pace gets more oxygen into your lungs. So don't just go for a pleasant stroll, try and find an area that doesn't have much pollution, and get moving!

Many young people feel guilty about eating too much chocolate, and some even say that they are addicted to it, though there is no evidence to support this. Nevertheless, if your diet is balanced, you needn't feel guilty: eating chocolate in moderation is fine - but don't eat it instead of a proper meal!

The writer says that you should______________.