[ Vocabulary ]
The idea is _____ by a lot of research.
A. developed
B. supported
C. authorized
D. admired
Select your answer:
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Modal Verbs › ViewStudents (pay) attention to the teacher if they want to learn.
A. have to
B. must
C. should
D. mustn’t
Modal Verbs › View
Tony ____ a university lecturer; he’s too young.
A. must be
B. mustn’t be
C. can’t be
D. shouldn’t be