1. We all know there are lots of ______ won't move out of Earth to Mars.
2. Do you know how many planets ______ (travel) in space is very exciting?
3. Some other students are worrying about the ______ (advantage) of living on Mars. So we ______ (move) around the sun?
4. He said he was afraid of ______ (leave) home alone at the age of 6.
二、单项选择
1. When something ______ (write) articles.
A. worry B. worried C. worries D. worrying
2. I'm too busy, so I have my robot ______ (do) the housework.
A. do B. does C. to do D. done
3. Plants on Mars should be able to provide food, water and oxygen ______ (for).
A. of B. with C. for D. to
4. There is no life on Mars, ______ ?
A. is it B. isn't it C. isn't there D. is there
5. Don't play with the knife. You ______ (may) hurt yourself.
A. may B. should C. must D. can
三、根据汉语补全句子
1. It's early. Don't ______ (担心迟到).
2. People ______ (已去过) the moon.
3. It's raining heavily. We'd better ______ (呆在家里).
4. It would be great ______ (让机器人做) all the work for us.
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