解析：while后主语及助动词不能省略，因为两句主语不一致

Mr Baker thought of the idea for the new machine (B / D) to his invention recently.

24. How many of us ______ a meeting that is not important to us would be interested in the discussion?

A. attended B. attending C. to attend D. have attended

解析：attending a meeting that is not important to us做定语

25. I can _____ some noise while I’m studying, but I can’t stand very loud noise.

A. put up with B. get rid of C. have effects on D. keep away from

解析：从后面的stand可以推断，这里用put up with 表示忍受

26. Before leaving home, make sure to turn off the electricity, lock the door, ______ the windows open.

A. and not to leave B. instead of leaving C. rather than leave D. and not leave

解析：lock和 turn都是不定式肯定形式lock 前省略了to ,但not to leave 是否定形式，to不可省

27. A mysterious illness, referred to as “ a typical phenomena”, has been brought under control, the government said on Wednesday, ______ no cause of it has been made public.

A. though B. when C. that D. because

解析：“尽管”没有病例公布

28. Space exploration has been made ______ with the development of modern science and technology.

A. it possible B. it was possible C. that possible D. possible

解析:该句测试是make sb./ sth.+adj. 结构，如果用A项，后应用to do sth.，因为it是形式宾语，代替不定式。

With the development of modern science and technology, man has made space exploration possible.

29. We want such materials ________ can bear high temperature and pressure.

A. that B. as C. what D. which

解析such materials as 引导的是定语从句,as 在从句中作主语;而such materials that 引导的是结果状语从句，that 在从句中不充当成分。

30. Hardly ___________the door when he rushed into the office out of breath.

A.I opened B. did I open C.I had opened D. had I opened

解析hardly 以及含有否定意义的副词放在句首，句子用倒装结构。

hardly…when/ no sooner…than 用法相同。

31. Yowill see this product wherever yogo.

A.to be advertised B.advertised C.advertise D.advertising

解析see+宾语+宾补(do/ doing/ done)

They discussed the plan they will see carried out the next year.

→They discussed the plan. They will see it carried out the next year.

32.The time is not far away modern communications will become widespread in China’s vast countryside.

A.as B.until C.before D.when

解析 句子可改为：The time when modern communications will become widespread in China’s vast countryside. when引导定语从句。

33. —I thought yowouldn’t mind.

—Well, as a matter of fact I ; but yoshould have asked me first.

A.did B.do C.won’t D.don’t

解析 省略句。As a matter of fact, I don’t mind. 从but…应看出用否定

34. It doesn’t matter to me I miss my train, because there’s another one later.

A.that B.if C.unless D. when

解析if引导条件状语从句(如果)。