[ Modal Verbs ]
You … be quiet when you’re in the library.
A. must
B. mustn’t
C. should
D. shouldn’t

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Grammar › ViewWhere … you last night?
A. were
B. was
C. have
D. has
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The present ______ is on the table is beautiful.
A. who
B. whom
C. whose
D. which
E. when