单项选择题

I must be off now，（）my sister is expecting me.

A.or
B.so
C.for
D.and

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单项选择题

The frightened children（）a sound.

A.dare not make
B.dare not to make
C.not dare make
D.not dare to make

单项选择题

Be sure to finish the work on time，but please remember，that we want（）high speed（）quapty.

A.both，and
B.either，or
C.neither，not
D.not，but also