下列各句中划线的词活用现象不同的一项是

Jane, which color do you prefer, red or blue—______. I prefer to buy a green one.

Work hard ， ________ you will fail the exam .

She is looking forward________to the ball.

How can we reduce CO2 in our home? —It’s easy．______off your TV or computers when you’re not using them, and you’ll greatly reduce it