— Lucy looks blue today.— Yes,but I don't know what it is ______ makes her so upset.

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• 1—  Was it by cutting down staff ______she saved the firm?   —  No, it was by improving work efficiency.

  A.when

  B.what

  C.how

  D.that

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• 2It was not until she had arrived home _____ her appointment with the doctor.

  A.did she remember

  B.that she remembered

  C.when she remembered

  D.had she remembered

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• 3It is not who is right but what is right _______ is of importance.

  A.which

  B.it

  C.that

  D.this

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• 4It was on my way back home ______ my teacher made the promise ______ I can do nicely next exam I will buy me a set of LuXun's Complete Works.

  A.when; that

  B.when; that if

  C.that; why

  D.that; that if

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• 5When I try to understand _______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.

  A.why it does

  B.what it does

  C.what it is

  D.why it is

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