Ⅰ.语法填空
1．—Must I hand in this paper one hour later?
—Yes, you________.
答案：must 句意：我必须一小时后交文件吗？——是的，必须。must可以表“推测”或“必须”，当表示“必须”时，肯定回答也必须用must。
2．—Many boats near the seaside were destroyed by the wind.
—Well, the wind ________ have been very strong.
答案：must 句意：——海岸附近的很多船都被风破坏了。——哦，那场风一定很大。can表示实际的可能性时，常用于否定句和疑问句中，用于否定句时，意为“不可能”；must表示接近事实的肯定推测，用于肯定句。
3．You ________ do the exercise if you don't want to.
答案：needn't 考查情态动词。句意：如果你不想运动，就不必做。needn't不必。
4．—Isn't that your head teacher over there?
—No, it ________ be him. I'm sure he has just left.
答案：can't can't不可能。根据语境及答语中的“I'm sure”，可知答话的人肯定那不是校长。
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