Our school has about 100 computers, but only sixty percent ____ used regularly.
| A．is | B．are | C．was | D．were |
Jim who is now our English teacher once ________ as a manager in an international cooperation for 5 years.
| A．has worked | B．had worked | C．was working | D．worked |
It is a common practice in China that the bride at the weeding ________ be dressed in red to ensure good luck.
| A．can | B．may | C．must | D．would |
–When did he come back last night?
--It was at 8 o’clock ________ I was watching a documentary on TV.
| A．since | B．that | C．when | D．which |
Don’t worry! All the problems will be settled ________ we join hands.
| A．only if | B．if only | C．what if | D．even if |
She told me that it had been worrying her much ________ her hair was turning gray.
| A．because | B．if | C．for | D．that |