It still puzzles today's scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)

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• 1She had hardly got back to the kitchen ________ the doorbell rang.

  A.when

  B.than

  C.as

  D.as soon as

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• 2Your sister has grown up. She is no longer __________ she five years ago when I first saw her.

  A.what

  B.who

  C.whom

  D.which

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• 340. —Shall Tom go and play football? —Not ________ he has finished his homework.

  A.when

  B.if

  C.unless

  D.once

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• 4She is getting better by degrees, but it will be some time _____ she is completely well.

  A.that

  B.since

  C.when

  D.before

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• 5. ____ I am concerned, we should be brave and we will reach the top of the hill at last ____ we try our best to climb the hill.

  A.So long as; as long as

  B.As far as; as longer as

  C.So long as; as far as

  D.As far as; as long as

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• 6The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.

  A.who

  B.when

  C.on which

  D.Which

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• 7Why is it _____ he can't get along well with his classmates?

  A./

  B.this

  C.that

  D.it

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• 8The buses, most of _______ were already full, were surrounded by an angry crowd.

  A.that

  B.it

  C.them

  D.which

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• 9Before the conference, a new problem came up __________ could speak on behalf of our group.

  A.that

  B.who

  C.which

  D.how

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• 10 You may give this message to _________ is at office.

  A.who

  B.whom

  C.whomever

  D.whoever

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