Scientistsareconvincedtheposit

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Scientists are convinced ___ the positive effect of laughter ____ physical and mental health.

A．of; on	B．by; in
C．of; at	D．on; at

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Pointing to the house on ______ roof grew lots of bush, the old man told me that was ______ I would stay.

A．its ；what

B．whose ；what

C．whose ；where

D．its ；where

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Choosing the right dictionary depends on ______ you want to use it for.

A．why

B．what

C．how

D．whether

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I don’t think the experiment is ______ failure. At least we have gained ______ experience for future success.

A．不填；the

B．a; the

C．a ; 不填

D．不填; 不填

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That year his total income, with his reward ______, _______ 1500 dollars.

A．added up to; added	B．added; added to
C．added to; added up to	D．adds; adds up to

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-----What do you think of the girl?
------Not only _______ hard but also_____ very charming.

A．does she work ; is she	B．she works ; she is
C．does she work ; she is	D．she works ;is she

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