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20. -- I’m terribly sorry that I missed your birthday part. I just completely forgot.

-- Oh, ______

A. that’s all right               B. take it easy

C. don’t mention it              D. that’s right

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19. You did turn in your report on time, but it ______ better, you know.

A. could be done                   B. must be done

C. could have been done              D. must have been done

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