一、选择填空：
( ) 1. _________ you always eat too much, you may be ill.
A. Before
B. If
C. Why
D. Which
( ) 2. _________ it was night, they stopped working.
A. As
B. But
C. And
D. If
( ) 3. The teacher had already left _________ I got to his office.
A. before
B. since
C. after
D. while
( ) 4. I have known him _________ he was a boy of eight years old.
A. when B since C. before D. while
( ) 5. He is listening to the music _________ she is cleaning the house.
A. after
B. that
C. before
D. while
( ) 6. Would you please look after my dog _________ I am out?
A. that
B. where
C. while
D. if
( ) 7. I’ll give the book to him as soon as I _________ him.
A. see
B. saw
C. am going to see
D. seeing
( ) 8. We’ll have a picnic on the island if it _________ fine tomorrow.
A. is
B. will be
C. must be
D. be
( ) 9. Jim may fall behind the other boys in his class when he ___ back from England next week.
A. comes
B. will go
C. goes
D. will come
( ) 10. The sports meeting _________ three days if it is fine.
A. lasts
B. will last
C. lasted
D. lasting
( ) 11. I _________ him since we last met in 2000.
A. won’t see
B. didn’t see
C. don’t see
D. haven’t seen
( ) 12. I didn’t begin the class _________ all the students _________.
A. until, stopped to talk
B. before, stopped talking
C. while, stopped talking
D. because, stopped talking
( ) 13. We’ll visit my aunt’s family if it _________ tomorrow.
A. isn’t going to rain
B. won’t rain
C. doesn’t rain
D. isn’t raining ( ) 14. Don’t get off until the bus _________.
A. will stop
B. is stopping
C. is going to stop
D. stops
( ) 15. You shouldn’t jump a queue _________ you have something important.
A. if
B. unless
C. so
D. if not
( ) 16. It _________ fifteen years since I taught in the school.
A. will
B. was
C. has
D. is
( ) 17. _________ he is young, he knows a lot of things.
A. As
B. Because
C. Although
D. If
( ) 18. The river is longer _________ that one.
A. as
B. so
C. than
D. such
( ) 19. He didn’t come to the party _________ he has a lot of work to do.
A. because
B. if
C. so
D. also that ( ) 20. We _________ in the factory since we moved to Shanghai.
A. have worked
B. worked
C. will work
D. are working ( ) 21. Everyone _________ before we got there.
A. had left
B. leaves
C. will leave
D. leave
