Exercise is something 61.________can help to make you look good, feel good and be healthy. Experts suggest that teenagers spend at least 30 minutes exercising, five times a week. That is easy to do! Walking and riding your bike count and so 62.________ school sports. Often, teenagers give up sport，63.________ (say) they have no time after their studies. Many teenagers are surprised to learn that when you exercise, your body 64.________(produce) some chemicals that make you feel peaceful and 65.________(relax) and increase your ability to concentrate when you study. These chemicals can even help you sleep better at night. 

 

A good amount of sleep every night 66.________(be) also important for your health. When you sleep, your body prepares you 67.________the day to come. Teenagers need eight to ten hours of sleep each night. As a matter of fact，68.________ (lose) of sleep can make you look tired, and even cause you 69.________ (gain) weight.

If you follow the suggestions above, you will look and feel much 70.________(good) in no time at all. 

答案

61. that　62. do　63. saying　64. produces/will produce　65. relaxed

66. is　67. for　68. loss　69. to gain　70. better