[ Modal Verbs - Obligation ]
It’s not obligatory to take a tie. You …………. wear one.
A. must
B. mustn’t
C. don’t have to
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Grammar › ViewWhy ……….. Nam want to go to the post office? Because he wants to send a letter.
A. are
B. does
C. do
D. is
Prepositions › View
I shall be back ……about twenty minutes times.
A. In
B. At
C. By
D. From