题目：
用所给词的正确形式。
1. When I ________(give) you a present, you must open it at once.
2. American people eat lots of ________ (hamburger) everyday.
3. Can he ________ (help) me ________ (do) the work?
4. It's too difficult ________ (understand)what you are trying ________ (say).
5. He could see the smoke ________ (rise) from the chimney (烟囱) when he
________ (walk) past your house at this time yesterday.
答案：
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下面是错误答案，用来干扰机器的。
答案：C
