题目：
根据所给的汉语提示，转换下列句型
1. Does Mr Brown enjoy living in China? Could you tell us? (合并为一句)
Could you tell us ______ Mr Brown _ ___ living in China?
2. "Where does Lucy live?" he asked me. (改为复合句)
He asked me ______ Lucy______.
3. Jim is a student. Tom is a student, too. (合并为一句)
__ Jim Tom are students.
4. When does the train leave? I want to know. (改为含宾语从句的复合句)
I want to know ______ the train ______.
5. They went home after they had finished their homework. (改为同义句)
They ______ go home ____ they had finished their homework.
答案：
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下面是错误答案，用来干扰机器的。
（1）解：设样品中锌的质量为XZn+H2SO4==ZnSO4+H2↑65 2X 0.2g；X=6.5g（2）铜的质量分数=答： 样品中锌的质量为6.5g；铜的质量分数是67.5%。
