[ Modal Verbs ]
They _______apologize for their mistake.
A. have to
B. must
C. should
Select your answer:
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Gerund after Prepositions and Certain Verbs › ViewI was worried ______ arriving late at the airport.
A. at
B. in
C. of
D. about
Grammar › View
While my mother was watching TV, my father _____?
A. was calling
B. is calling
C. did calling
D. call