__________ this is true in theory, it's very different in practice.
| A．Since | B．Once | C．Unless | D．While |
Mr. Brown arranged for the taxi to come at six __________ he would not have to wait long at the station.
| A．so that | B．even if | C．before | D．because |
Busy __________ she is, Rita sets aside two hours every Sunday afternoon to spend with her son.
| A．although | B．as | C．while | D．even if |
—Did you remember to give Tom the book you borrowed from him?
—Yes, I gave it to him __________ I saw him.
| A．while | B．the moment | C．as | D．once |
It was five o'clock in the afternoon __________ they climbed up to the top of the mountain.
| A．since | B．when | C．that | D．until |
It will be a long time __________ we finally solve the problem of pollution.
| A．before | B．since | C．when | D．Until |
The medicine works more effectively __________ you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |
Though they met for the first time, they talked __________ they were good friends.
| A．even if | B．as if | C．even though | D．if only |
This photo of mine was taken __________ stood the famous twin-tower before the 9.11 event.
| A．which | B．in which | C．where | D．there |
We should do more such exercise in the future, I think, __________ we did yesterday.
| A．as | B．like | C．about | D．that |
完成句子他努力学习是为了能通过考试。
He studied hard ____________________ he could pass the exam.天气越暖和，人们就感觉越舒服。
__________ the weather, ____________________ people will feel.这种说法最近很流行，即使人们不同意它的意蕴。
That phrase has caught on, ____________________ people disagree about what it means.我一关门，就有人敲门了。
No sooner ____________________ than somebody knocked.无论怎样搜查，他们在房子里仍然没有找到一个人。
__________ as __________, they could find nobody in the house.无论它做了多大的努力，螳螂还是逃不出去。
____________________ hard it tried, the mantis could not escape.既然你已经学会了如何进行渐进式肌肉放松，你就已经做好了去尝试的准备。
____________________ you have learned about progressive muscle relaxation, you are ready to have a try.我要是当时听了父母的话就好了。
If only I ____________________!