1 . Be careful, _______ when the floor is still wet.
A.possibly | B.extremely | C.certainly | D.especially |
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2 . Children find it ________ to sit still for very long.
A.difficultlies | B.difficulty | C.difficulting | D.difficult |
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3 . I don’t think it’s ________ to copy so many questions before the exam.
A.necessarily | B.unnecessarily | C.necessary | D.necessity |
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