– Have they found out the _____ of the fire?
-- Yes. It was a cigarette end that _____ the fire.
| A．cause; started | B．reason; caused |
| C．causing; caused | D．reason; cause |
13． --Hi, Lydia． Are you going to the concert on Friday?
- -I’d like to. But there are so many problems ____.
| A．remaining to be settled | B．remained settling |
| C．remaining to settle | D．remained to be settled |
12． So little ____ about science that the lecture was ____ my understanding.
| A．I know; over | B．knew I; beyond |
| C．did I know; beyond | D．did I know; over |
11． Information has been put forward ____ more measures will be taken to solve the economic problems.
| A．while | B．when | C．as | D．That |
10．–Don’t put the waste on the ground, young man.
--Oh, I’m sorry. I ____ the dustbin there.
| A．didn’t see | B．hadn’t seen | C．can’t see | D．wasn’t seeing |
9． --I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.
--Oh，it____ my uncle. He was in my room then.
| A．should have been | B．should be | C．must have bee | D．must be |