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Please ask the children ________ football in the street.

[　　]

A．not play	B．not playing
C．don't play	D．not to play

The police warned the children __________the football in the street.

A．don’t play

B．not play

C．to not play

D．not to play

The teacher often warns the children        football in the street.

A．to play

B．not to play

C．not play

D．don’t play