题目内容：

Rewrite the following sentences as required （根据所给要求，改写下列句子。每空限填一词）

1.The hall is too small to hold so many students. (保持句意不变)

The hall is _______small ______ it can’t hold so many students.

2.Few students could solve this difficult math problem. (改为反意疑问句)

Few students could solve this difficult math problem, ________ ________ ?

3.It took the workers three years to build the new bridge. (保持句意基本不变)

The workers ________ three years ______ the new bridge.

4.Hangzhou is about two hours’ drive from Shanghai. (对划线部分提问)

______ ______ is Hangzhou from Shanghai?

5.When, turn off, a class, please, you, your mobile phones, are having.  (连词成句)

____________________________________________________________________ .