[ Grammar ]
Jeanette did very badly on the exam. She _____ harder.
a. must have studied
b. should have studied
c. could have studied
d. must studied

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Verb-ing or to Verb › ViewThe students ______ up the classroom after they made a mess.
A. were asked cleaning
B. were let clean
C. made to clean
D. were made to clean
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He has lived here since he ________ here.
A. came
B. has came
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A. because
B. for instance
C. although
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Ava ________ abroad for a year and now she is coming back home.
A. had studied
B. is going to study
C. studied
D. has been studying