Children’s brains cannot develop properly _________ they lack protein.
| A．because | B．since | C．when | D．unless |
Milk will turn sour soon on hot days ______ it is stored in the refrigerator．
| A．since | B．until |
| C．because | D．unless |
There is still a lot for Chinese Women’s volleyball team to improve _____ they have obtained a string of wins.
| A．now that | B．as if | C．even though | D．given that |
Why do you insist on buying a car ______ you have such good public transportation here?
| A．because | B．unless | C．when | D．though |
I can judge which part of China you come from you open your mouth.
| A．while | B．the moment | C．since | D．every time |
Such good use had been his spare time_________ his English has improved a lot．
| A．made of; as | B．made of; that | C．made in; that | D．found in; as |
Jerry has promised to keep the secret, so he won’t tell anyone even though .
| A．asking to | B．to be asked | C．to ask | D．asked to |
We climbed higher _____ we might see the scenes better.
| A．sothat | B．even though | C．in case | D．as if |
______ I admit that there are quite a few problems, I don't agree that they cannot be solved.
| A．Supposing | B．Since | C．While | D．As |
The new policy allows a couple to have a second birth _____either is an only child.
| A．though | B．if | C．unless | D．until |
Cheer up! It won’t be ______ we can meet again.
| A．before long | B．long before |
| C．after long | D．long since |
_____ we have enough evidence, we can’t win the case.
| A．Once | B．As long as | C．Unless | D．Now that |
As Benjamin Franklin put it, “A house is not a home it contains food and fire for the mind as well as the body. ”
| A．since | B．as | C．once | D．unless |
It was several minutes ____we realized what was happening-our dog was trapped in a newly-dug tunnel.
| A．since | B．before | C．until | D．while |
_________ we have been classmates for three years, she hasn’t left me much impression, so I can’t remember her after graduation.
| A．Since | B．Although | C．Because | D．Unless |
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