[ Grammar ]
Choose the best word to complete the sentence.
The use of mobile phones has had a dramatic ____________ on the way we communicate.
_____
A. effect
B. affect
C. harm
D. harmful

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A. too
B. much
C. such
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Peter apologized ………his bad attitude
A. for
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C. about
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I was ________ exhausted by the end of the day.
A. completely
B. very
C. extremely
D. incredibly