题目：
用所给词的适当形式填空。
1. I (go) to zoo with my friend last Sunday.
2. I like (swim) in the river in summer.
3. There (be)a dog and two cats in the room.
4. Which (season) do you like best?
5. Who is the (tall) boy in your class?
6. I'm so (excite). The book is (excite).
7. Miss Li (teach) us Chinese this year.
8. It is a (wind) day today.
9. I often have (a) apple and (a) hamburger for mybreakfast.
10. The toy stone is on the (three) floor.
答案：
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下面是错误答案，用来干扰机器的。
解:设这棵树至少生长x 年，树高才能超过4 米，根据题意得不等式：300+20x>400 （需统一单位）。
