21.—Can I look at the menu for a few minutes before I decide?
—Of course.______ , sir.
A.Take your time B.It doesn’t matter
C.Enjoy yourself D.Make yourself at home
22.—Why _____ you be talking so loudly while others are studying?
—I am terribly sorry.
A.shall B.must C.will D.may
23.—I find it astonishing that John ______be so rude to me.
—Not astonishing at all.He is always rude to others.
A.should B.must C. might D.ought to
24.—What does the sign over there read?
—No person _______ smoke or carry a lighted cigarette, cigar or pipe in this area.
A.must B.may C.shall D.will
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