[ Grammar ]
Where ____ they ___________ sleep yesterday?
A. did…… have to
B. did……. has to
C. do…. have to
D. does…. have to

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Grammar & Vocabulary › ViewWould you like to join us?
A. Yes, I do.
B. Yes, I would.
C. Yes, I like.
Modal Verbs › View
Adults ___________ buy tickets to attend the event. It is an obligation.
A. have to
B. don’t have to
C. has to
D. doesn’t have to
Grammar › ViewThe trip to Berlin will be cancelled ______ more students sign up.
A. in case
B. unless
C. as long as
D. provided that
Grammar › View
They __________ us that we were wrong.
A. convinced
B. persuaded
C. both
