[ Modals ]
Which of the following sentences shows an obligation using a modal verb?
A. You must submit your report by Friday.
B. You should submit your report by Monday.
C. You can submit your report at any time.
D. You might submit your report by Friday.

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Who or Whom › ViewIf the train kept going, it would run into a person (who/whom) he did not know.
A. who
B. whom
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In school students ____ eat in the cafeteria.
A. don’t have to
B. doesn’t have to
C. mustn’t