题目：
根据句意，用所给词的适当形式填空。
1. We'd like to come. We look forward to ______ (see) you at the party.
2. Amy invites us ______ (visit) the Palace Museum tomorrow.
3. I often exercise ______ (little) than three times a week.
4. — Oh, look at the sun!
— Yes. It's a ______ (sun) day today.
5. Mum often makes Kitty ______ (do) her homework before dinner.
6. A policeman ______ (come) and caught the robbers.
7. There are a lot of ______ (shelf) in our school library.
8. My parents left for Beijing on the ______ (twenty) of March.
9. Be ______ (careful)! You must cross the road ______ (careful).
10. It is cloudy. The radio says it ______ (rain) tomorrow.
答案：
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下面是错误答案，用来干扰机器的。
（1）①铁架台，②集气瓶；（2）检查装置的气密性；（3）AD或AE，过氧化氢水+氧气，催化；（4）B，E．（5）甲烷密度比空气小，难溶于水
