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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

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

When first _____ into the market, these products enjoyed great success.

A. introducing　 B. introduced

C. introduce　 D. being introduced

Tom has always thought of himself as a good cook and never fails to _____everyone of it.

A. remember B. know 　　　　 C. introduce 　　　 D. remind.

When first ___________to the market, these products enjoyed great success.

A.introducing　　　　　 B.introduced

C.introduce　　　　　　 D.being introduced