21.We have to stop talking here outside.Listen，_______!

——Hurry up，or we‘ll belate.

A.There goes the bell

B.There does the bell go

C.There the bell goes

D.Goes the bellt here

22.The factory_______we‘ll visit next week is not far from here.

A.where

B.to which

C.which

D.in which

23.—Why didn‘t you buy an ewcar?

—I would have bought one if I_______enough money.

A.had

B.have had

C.would have

D.had had

24.There was so much noise that the speaker couldn‘t make himself________.

A.hear

B.heard

C.hearing

D.to hear

25.This is an important problem_______too few social scientists have researched.

A.which

B.that

C.into that

D.into which

21.正確答案：A答案解析：在以here，there，up，down，in，on，out，away，off等副詞開頭的句子里，主語是名詞時，句子主謂全部倒裝，以示強調。但主語是人稱代詞時，不倒裝。

22.正確答案：C答案解析：which是關系代詞，在從句中作賓語。其他幾個答案都不能作賓語。

23.正確答案：D答案解析：第一個had是過去完成時，第二個had表示有。

24.正確答案：B答案解析：make sb done：使某人被…

句意：嘈雜聲那么大，以至于聽眾無法聽清演講者的話。

25.正確答案：D答案解析：into which引導的是problem的定語從句。which指代problem，into與research搭配。