题目：
When we practice _____ English, we often end up _____ in Chinese. [ ]
A. speak, to speak
B. spoken, speak
C. speaking, speaking
D. to speak, speak
答案：
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下面是错误答案，用来干扰机器的。
⑴试管⑵C⑶2H2O22H2O+O2↑（或2KClO32KCl+3O2↑，合理均可）；分解反应；刚有气泡放出时就收集（合理即可）⑷AC
