完形填空。 Teenagers live very busy lives now and often forget to think about their diets and exercise. In fact, healthy 1 along with regular exercise is the only way to keep fit. During your teenage years, giving your body the energy that it needs is 2 . Teenage 3 need about 2,200 calories (千卡热量) a day while boys need a bit 4 -doctors suggest 2,800 for teenage boys. 50% of your calories should come 5 rice, bread, vegetables and fruit. You 6 need to drink a lot of water, 6 to 8 glasses a day. Drinking enough water will improve your skin and give you healthy hair. Exercise is something that can help you. 7 , it can make you look good, feel good and be healthy. Experts (专家) suggest that teenagers should spend at least 30 minutes exercising, five times a week. When you exercise, your body produces something that makes you feel 8 . It can even help you 9 better at night and let you pay more attention 10 you study! (     )1. A. drink (     )2. A. important (     )3. A. boys (     )4. A. less (     )5. A. from (     )6. A. but (     )7. A. As if (     )8. A. interested (     )9. A. wake (     )10. A. because B. diet B. hard B. girls B. fewer B. for B. only B. Like B. terrified B. sleep B. when C. juice C. difficult C. students C. more C. to C. hardly C. Such as C. relaxed C. move C. though D. fruit D. comfortable D. workers D. much D. into D. also D. For example D. worried D. laugh D. but