It is worth considering what makes"convenience" foods so popular, and __ better

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It is worth considering what makes"convenience" foods so popular, and __ better ones of your own.     [     ]
A. introduces
B. to introduce
C. introducing
D. introduced

答案

举一反三

-Can I smoke here?
-Sorry. We don"t allow________here.  [     ]
A. people smoking
B. people smoke
C. to smoke
D. smoking

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Isn"t it time you got down to _____ the papers?[ ]

A. mark
B. be marked
C. being marked
D. marking

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Psychologists say that______our emotions will makeus feel better and there is nothing to be
ashamed of.    [     ]
A. relieving
B. relaxing
C. releasing
D. removing

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I have never dreamed of ______such a beautiful place in the world.  [     ]
A. there is
B. there to be
C. there being
D. having

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More attention should be paid to ______ our environment. [      ]
A. protect
B. protecting
C. prevent
D. preventing

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