6. Don’t go home _______ you have cleaned the classroom.

　 A. by　　　　　 B. then　　　 C. only　　　　　 D. until

5. He told us _______ he was over eighty years old.

　 A. where　　　 B. then　　　 C. if　　　　　　 D. that

4. _____ you come back, please let me know.

　 A. Later　　　　 B. Until　　　 C. As　　　　　 D. As soon as

3. The doctors are very tired, _______ they are still working very hard.

　 A. but　　　　 B. if　　　　 C. only　　　　　 D. when

2. Study harder, ______ you will fall behind others.

　 A. and　　　　 B. or　　　　 C. but　　　　　 D. so

1. LiMeng passed his mother his cup _______ asked for some more tea.

　 A. but　　　　 B. or　　　　 C. and　　　　　 D. if

10.　 We’ll help you. You’re in trouble.

9.　　　 I will believe it. I see it with my own eyes.

8.　　　 They tried to work out the difficult problem by themselves. They asked the teacher.

7.　　　 I saw a wallet on the ground. I was walking in the street.