[ Grammar ]
It is essential that students _____ develop a good study habit for effective learning.
A. should
B. can
C. must
D. will

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Tenses › ViewJohn ____ for China 2 days ago.
A. was leaving
B. left
C. was left
D. had left
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Rubbish bins…. every other day
A. will be opened
B. were killed
C. are emptied
D. are damaged
