Topics: Modal Verbs
It’s a school rule to be on time. → Students __________ be on time.
A. should
B. must
C. can
D. shouldn’t
Select your answer:
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Grammar › Viewchoose the right collocative word for — ‘wall’
A. door
B. window
C. clock
D. table
Grammar › View
Operant conditioning involves rewarding or punishing certain behave to reinforce or extinguish its occurrence.
A. behave
B. to reinforce
C. or extinguish
D. its occurence