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I want to watch the ball game．Can you ________ the TV?

A．turn on

B．turn off

C．open

D．close

Don’t forget to ________ the blender after the shake is ready．

A．turn on

B．turn off

C．open

D．close

We must always remember to ________ the lights before we leave the room．

A．turn on

B．switch off

C．close

D．open