Vitamin C helps our bodies make a special chemical, which _______ affects our brains, making us feel happy.

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• 1Yesterday he called ____ me ____my office and told me the good news.

  A.at, at

  B.on, on

  C.at, on

  D.on ,at

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• 2The approach ______ the problem is contrary ______ our expectation.

  A.to; to

  B.of; to

  C.to; on

  D.for; on

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• 3We have to give the users something new ________ what we've already offered, which is the only way to broaden the appeal of the website.

  A.regardless of

  B.in addition to

  C.in exchange for

  D.according to

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• 4I congratulated them all ____ their results.

  A.on

  B.in

  C.about

  D.for

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• 5----I wonder how much for your services. ----The first two are free ________ the third one costs $30.

  A.while

  B.until

  C.when

  D.before

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• 6We always have spaghettis on Thursday.  Let's have pizza ______ a change.

  A.in

  B.on

  C.with

  D.For

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• 7Finding a job in such a big company has always been ____ his wildest dreams.

  A.under

  B.over

  C.above

  D.beyond

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• 8The business success has made the Apple the focus of world attention. ________, the effort made by Jobs, its founder, has paid off.

  A.On the contrary

  B.In a nutshell

  C.On the other hand

  D.For short

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