If you miss this chance, it may be years ____ you get another one.
| A．As | B．before | C．since | D．after |
We need to get to the root of the problem______ we can solve it.
| A．while | B．after | C．before | D．as |
There is only one more day to go your favorite music group play live.
| A．since | B．until | C．when | D．before |
I believe you will have a wonderful time here you get to know everyone else.
| A．though | B．as if | C．once | D．so that |
______ he once felt like giving up, he now has the determination to push further andkeep on going.
| A．Where | B．As | C．In case | D．Now that |
scientists have learned a lot about the universe, there is much we still don't know.
| A． | Once | B． | Since | C． | Though | D． | Unless |
Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．When |
______ more and more people may turn to the Internet for the latest news, it is unlikely that the newspaper will disappear．
| A．When | B．Because | C．Since | D．While |
She refused to follow our advice on the job, _______ it would have a great effect on her career.
| A．even though | B．as if | C．now that | D．in case |
People sometimes think that shy people are cold and uninterested in other people _______ actually they are just afraid to meet them.
| A．since | B．unless | C．when | D．until |
—Jenny, will you leave now?
—No．It will be two weeks ____ I leave here．
| A．while | B．since | C．before | D．when |
— Did you remember to give Jack the book?
—Yes, I gave it to him ______ I saw him.
| A．while | B．immediately |
| C．once | D．suddenly |
Don’t turn off the computer before closing all the programs, _____ you’ll have problems.
| A．but | B．and | C．so | D．or |
They’ve moved to a different house_________their children can attend a better school.
| A．in case | B．so long as |
| C．so that | D．even though |
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