It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.

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• 1We really enjoyed Disneyland. We took all the rides, some of ________ twice, and had lots of fun. I felt just like a kid again.

  A.which

  B.that

  C.it

  D.them

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• 2It was not until dark ______ he found ______ he thought was the correct way to solve the problem.

  A.that; what

  B.that; that

  C.when; what

  D.when; that

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• 3Students should be encouraged to ______ their own opinions, ______ right or wrong.

  A.present; whether

  B.compare; no matter

  C.announce; no matter

  D.remark; whether

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• 4A turning point of the continuously high housing price won't appear suddenly because there must be a certain process_______many factors lead to the change.

  A.which

  B.what

  C.where

  D.that

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• 5 _____ I care about most is whether the company provides opportunities for further education.

  A.Whether

  B.What

  C.That

  D.Which

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• 6How can they expect to learn anything ________they never listen?

  A.while

  B.unless

  C.lest

  D.when

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• 7I have been advised to arrange for insurance _________ I need medical treatment.

  A.so that

  B.unless

  C.in case

  D.though

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• 8He was about to tell me the secret ______ someone patted him on the shoulder.

  A.as

  B.until

  C.when

  D.while

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• 9Provide your doctor with a detailed medical history ____ he can give you the accurate treatment

  A.even if

  B.in case

  C.so that

  D.as though

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• 10It just isn't fair that____ I was working as a waiter last month, my friends were lying on the beach.

  A.while

  B.whenever

  C.though

  D.for

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