-Did you reach the US the next day?
- No. Somehow . it was three days_______ I arrived there.
| A．since | B．when | C．that | D．before |
We students are so busy with our homework that we have no time for outdoor exercise, ______ we have the desire.
| A．wherever | B．whenever | C．even if | D．as if |
—People often don't appreciate what they have, do they?
—No, _________ they lose it.
| A．if | B．after | C．until | D．when |
______ we have planned ahead might change when we put it into practice．
| A．Whatever | B．Whenever |
| C．Whoever | D．However |
Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
| A．after | B．before | C．since | D．when |
There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
| A．since | B．if | C．as | D．while |
All the photographs in this book, stated otherwise, date from the 1950s.
| A．unless | B．until | C．once | D．if |
Mary won’t keep slim ______she takes exercise every day.
| A．unless | B．if | C．when | D．or |
It is freezing here． Wear your coat, ______ you’ll catch a cold．
| A．or | B．so | C．but | D．and |
---How long do you think it’ll be _____ I can go back to work?
--- Well, you’ll be feeling much better by next weekend.
| A．before | B．when | C．until | D．that |
It took me quite a long time to develop a voice, and _______ I have it, I am not going to be silent.
| A．now that | B．unless |
| C．so that | D．although |
You'd better prepare some candles at home the power fails．
| A．even though | B．in case |
| C．as long as | D．in order that |
_____ the days went on, my memories seemed to get worse.
| A．With | B．Since | C．As | D．While |
It was __________she was injured in the accident _______ she didn’t come to the party yesterday.
| A．as; which | B．because; that |
| C．since; why | D．for; how |
I travel to the Binhai New Area by light railway every day，________ do many businessmen who live in downtown Tianjin.
| A．as | B．which | C．when | D．though |
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