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