题目：
句型转换，每空一词。
1. I'm certain that he's telling the truth.
There's ________ that he's telling the truth.
2. They are busy with their test and have no time to have a rest.
They ________ in their test and have no time to have a rest.
3. The house which is being built is our classroom.
The house ________ is our classroom.
4. All of us must make decisions wisely about what is to be done every day.
All of us must make ________ decisions about what ________ every day.
5. I would rather be punished than tell a lie.
I ________ punished rather than tell a lie.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
溶液、Na2CO3溶液中的一种。请你将它们区分出来，并完成下面的实验报告。
