题目：
用所给单词的适当形式填空。
1. Would you like to _____________ (plant) trees?
2. She can _____________ (swim) in the river.
3. Let me _____________ (have) a look.
4. Mary _____________ (read) a book now.
5. Let's _____________ (invite) your parents to the party.
6. She has twelve _____________ (knife).
7. I like collecting _____________ (leaf).
8. Last year Mr. Black _____________ (study) Chinese.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E解析：胸壁僵硬、呼吸肌力变弱、肺弹性下降及闭合气量增加是造成老年人呼吸功能降低的主要原因。
