531. I have to go now. Please remember to ____ the lights when you leave.

A. turn off　　 B. turn down　　 C. turn up　　 D. turn on

530. You’ve never seen such a wonderful film, ____?

A. don’t you　　 B> haven’t you　 C. do you　　 d. have you

529. The doctor did what he could ___ that child.

A. save　　 b. to save　　 C. saved　　 D. saving

528. “Harry Potter” is a very nice film. I ____ it twice.

A. will see　　 B. have been　　 C. saw　　 D. see

527. I have ___ to tell you.

A. something interesting else　　 B. interesting something else

C. something else interesting　　 D. interesting else something

526. He was pretending___ when I came into the room.

A. study　　 B. to study　　 C. studying　　 D. studied

525. They cried ____ the loss of the match.

A. because of　 b. because　　 C. as　　 D. for

524. They don’t know ____ do it.

A. how　　 B. how to　　 C. when　　 D. what to

523. I found ___ difficult ____ out the problem.

A. this, to work　　 B. it, work　　 C. it, to work　　 D. it, working

522. He tried ____ laugh, but he found it difficult.

A. doesn’t　　 B. don’t to　　 C. not　　 D. not to