You must be careful when using those ___________ because they ...

[ Grammar ]

You must be careful when using those ___________ because they are very sharp.

A. knife

B. knifes

C. knive

D. knives

Select your answer:

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The train will arrive _____ time. It always arrive at the stated time.

A. on

B. in

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Select the progressive verb tense phrase in the sentence:

Rebecca will be visiting her grandmother in Maine next summer.
_
A. Rebecca

B. will be visiting

C. visiting

D. her grandmother