A. in B. at C. behind D. after

—I hope so.

A. fewer, less B. less, fewer C. less, less

【题目】- You won't pass the exam you don't work hard.
- OK, I'll do my best.
A.and
B.but
C.if
D.so

—I’m not sure．Maybe he is an artist.

A. what the man with long hair is

B. what is the man with long hair

C. who the man with long hair is

【题目】-- I hear Tom is leaving.
-- why?
A.And
B.But
C.Or
D.So

–No, ______.

A. they won’t B. they will C. they want D. they would not

【题目】- The air pollution is terrible.
- It will be worse ________ we take action to protect the environment.
A.if
B.unless
C.until
D.when

A. can B. can’t

C. could D. couldn’t

A. mix up them B. mix them up C. mix up it

—Go ______ the bridge. You’ll see it on your left.

A. on B. over C. across D. through