[ Modal Verbs ]
There is a knock at the door. It________my mom. It’s time for her to be back home.
A. may be
B. may not be
C. must be
D. mustn’t be

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A. noisiest
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We learned that …………………….. stinging nettle plant can be harmful when touched with bare hands.
A. _
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At 9 p.m. last night, my friend ___ jokes that made everyone laugh.
A. am telling
B. was telling
C. is telling
D. are telling
