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科目: 来源:不详 题型:单选题

—It’s too late. I have to go now.
—Oh, it’s raining outside. Don’t leave _______it stops.
A.since B.until  C.while

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科目: 来源:不详 题型:单选题

I was doing my homework _______ mother was cooking.
A.when B.whileC.asD.what time

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科目: 来源:不详 题型:单选题

--- When did your father come back last night?
--- He didn’t come back _______ he finished all the work.                                                           
A.untilB.whileC.ifD.unless

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科目: 来源:不详 题型:单选题

Nobody will help you________ you help yourself.
A. unless               B.  because             C. though

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科目: 来源:不详 题型:单选题

Think it over, _____ you’ll work out the math problem.
A.orB.soC.forD.and

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科目: 来源:不详 题型:单选题

—Susan, what are the advantages of MP5 players?
—Mom, they are smaller and lighter ______ they can be carried very easily.
A.unlessB.if C.untilD.so that

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科目: 来源:不详 题型:单选题

—Shall we get off the bus here?
—Yes. But we won’t get off _______ it stops.
A.whenB.untilC.whileD.after

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科目: 来源:不详 题型:单选题

Time waits for no man. But teenagers won’t realize the value of time until it’s gone. Don’t waste your time,        you will regret it.
A. and               B. or                  C. but

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科目: 来源:不详 题型:单选题

We can’t do well in examination _________ we study hard in school time.
A.ifB.andC.sinceD.unless

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科目: 来源:不详 题型:单选题

Although they feel tired,__________they still go on working.
A.andB.butC./D.so

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