请根据要求改写下列句子，每空一词。

小题1:You’d better eat some bread now.(改为否定句)

You’d better _________ eat _________ bread now.

小题2:Elsa spends $30 buying books each month.(保持句意基本不变)

The _________ of Elsa’s books _________ $30 each month.

小题3:Kate will return to school in a week.(对划线部分提问)

_________　_________ will Kate return to school?

小题4:Leo and David are the same age.(保持句意基本不变)

Leo is as ________ _________ David.

小题5:I went to bed after I finished my homework.(保持句意基本不变)

I ________ go to bed _________ I finished my homework.

多级压缩式空压机具有中间冷却方式，这可以减少功耗。