20.In no way ______leave ______ little children alone.
A.we must; so B.must we; such
C.must we; so D.we must; such
19.- What does the sign over there read?
- No person ______ smoke or carry a lighted cigarette, or pipe in this area.
A.will B.must
C.may D.shall
18.How long is it ______ we last spent the holiday in the country together?
A.until B.before C.since D.that
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