题目内容
19．When you goacross（cross）the street，you must be careful．分析 当你过马路时，一定要小心．
解答 答案：across．
根据When you go--（cross）the street，you must be careful，可知当你过马路时，一定要小心．这里go是个动词，后面应该用介词across表示穿过．故填across．
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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根据短文内容填空，每空不超过3个词．
It is suggested that most adults need seven to nine hours'sleep．As for teens，they need even more．If you aren't getting enough sleep，you should：
•Avoid caffeine（咖啡因）
You should avoid drinking caffeinated drinks such as coffee，tea and soda for at least 10 hours before you go to bed．
•Avoid eating big meals before sleeping
Eating a big meal can make you feel sleepy，and it can make you feel uncomfortable and prevent you from
sleeping well．
•Build a healthy sleep environment
With the light on，can you have a good sleep？Of course not，and you'd better keep your bedroom dark and cool．
•Avoid using electronics before bed
The light from electronics can keep you from falling asleep．Try reading or listening to quiet music instead．
Please get enough sleep from now on．
根据短文内容填空，每空不超过3个词．
| Get enough sleep | |
| The results of lacking（缺乏）sleep | ★It makes you feel tired and sleepy throughout the day． ★It's easy to keep your eyes（76）closedas you study． ★You may nod off while driving． |
| The time of sleeping | ★Most adults need seven to nine hours'sleep while teens need（77）even more． |
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