题目内容

Don't forget_______ your teeth before you go to bed.

A. brush
B. to brush
C. brushing

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______ a jacket. It's cold outside.

A. Taken
B. Took
C. Take

All guests must_______ at the front desk.

A. signing in
B. sign in
C. signed in

_______ leave! We haven't finished yet.

A. Don't
B. Not
C. No

_______ careful! You almost spilled coffee on me.

A. Being
Be
C. Not be

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