1. 应当教育孩子们尊敬老年人。

Children ought to be educated to _______  ________  _______ the old people.

2. 学生们迫不及待期中考试后回家。

The students ______  _______  _______ go home after the mid-term examinations.

3. 她没来的原因是她的车在半路抛锚了。

The reason _______  _______ she was absent was ______ her car broke down halfway.

4. 你不应该出去踢足球，因为你有好多作业要做。

You _____ not _______  _______ go out to play football, with so much homework to do.

5. 我现在回想起来，还是不明白什么地方出了问题了。

______  _______  _______ it now, I still don't figure out what's wrong with it.

最佳含水量是根据不同土类的性质，采用不同的试验方法确定的，测定无黏性自由排水粗粒土和巨粒土(包括堆石料)的最佳含水量可采用的方法是( )。

A．轻型击实试验

B．中型击实试验

C．振动台法

D．以上方法都不适用