阅读理解填词。

　　Teenagers are always stressed out now．They are often too b　　1　　 to think about their diets and exercise．The truth is, healthy eating, a　　2　　 with regular exercise．Is the only way to k　　3　　 fit．

　　During your teenage years, it is important to give your body the e　　4　　 it needs．Teenager girls need about 2,200 calories(卡路里)a day and boys need a bit more．Doctors suggest 2,800 calories for teenage boys．50% of your calories should come from rice, bread, v　　5　　 and fruit．You also need to drink a lot of water, six to eight g　　6　　 a day．Enough water will improve your skin and give you healthy hair．

　　Exercise can help to make you look good, feel good and be healthy．Scientists suggest that teenagers should spend at least 30 minutes e　　7　　 every day．

　　When you exercise, your body p　　8　　 something．It makes you feel r　　9　　 and energetic．It can even help you sleep better at night and let you pay more a　　10　　 when you study．

　　Let's eat healthily and take regular exercise．

从方框内选择适当的词汇,并用其正确形式填空。其中有三项多余

　　We all need 　　1　　．Doctors say it is good for us．It makes your heart and body 　　2　　．It also gives you more energy．And you will feel 　　3　　about yourself．It’s best to exercise 　　4　　a week．Twenty minutes each time is enough．

　　There are many ways to exercise．You can walk, run, play sports 　　5　　 swim．Many people go to special places to exercise．They are 　　6　　 fitness centers’．These places have 　　7　　 equipment(设备)．Some people buy equipment for their homes．But it is very 　　8　　．

　　　　9　　can be fun．Friends can exercise together at a fitness center．Or, they can play sports together．　　10　　 do you exercise?

根据汉语意思完成句子

你多久锻炼一次？

________　________ do you exercise?