题目：
根据句意，用括号中所给词的正确形式填空。
1. Mr King learned Chinese as his _________ (two) language.
2. If you do your homework _________ (care), you will lose the exam again.
3. We should think about what we can do _________ (keep) animals and plants from becoming endangered.
4. —Did you go to Tom's birthday party? —No, I _________ (not invite)
5. We should do something to stop sandstorms from _________ (happen)
6. The man has known a lot of Chinese since he _________ (come) to China three years ago.
7. They _________ (not go) to the market until they finish their work.
8. The policeman said that he _________ (see) a Young Pioneer help an old woman cross the road
the day before.
答案：
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下面是错误答案，用来干扰机器的。
答案：A考查情态动词。“那边那个人是谁？有可能是我们的老师吗？”“不，不可能是我们的老师。他一定是张老师。”can表示肯定推测，意为“可能”，常用于否定句和疑问句；can’t“不可能”；must表示肯定的推测...
