题目：
用所给词的适当形式填空。
1. — How many teachers are there in your school?
— About 200. One third of them _____ (be) men teachers.
2. I'm sorry to keep you _____ (wait) for so long.
3. — What are you going to do, Tom?
— I'm going to get my computer _____ (mend)
4. The Yangtze River is the third _____ (long) river in the world.
5. I'm looking forward to _____ (take) holiday in Hainan.
答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：根据反应X＋2Y→R＋2M，，已知R和M的摩尔质量之比为22：9，可确定R和M的质量比为22：18，故当反应生成生成4.4gR时，可算出得到M的质量为3.6g，再根据质量守恒定律，化学反应前后质量不变，可直...
