题目内容

All guests must_______ at the front desk.

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

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_______ 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

_______ this medicine before you go to bed, OK?

A. Taking
B. To take
C. Take

_______ warmly and you won't catch a cold.

A. Dress
B. To dress
C. Don't dress