I.选择填空：
1. The man can’t get on the bus because there ________ no room on it.
A. was B. is C. are D. were
2. I was listening to the music ________ there was a knock at the door.
A. while B. when C. because D. until
3. You may leave the classroom when you ________ writing.
A. will finish B. are finishing C. have finished D. had finished
4. I don’t know if he ________ tomorrow, if he _________ ,I’ll meet him.
A. will come, comes B. comes, comes
C. will come, will come D. come, will come
5. ________ I read, the more I understand.
A. The more B. So much C. How much D. For all
6. Would you give Johnny this letter if you ________ to see him this week.
A. will happen B. happen C. are happened D. happened
