1 . —Tim, you spend too much time on computers. It’s harmful to your eyes.
—I see. Thank you. I’ll do more sports instead.

A．is good for

B．is bad for

C．is useful to

2 . 中国梦的提出有助于推进我们祖国快速发展。
The idea of Chinese Dream is useful to ______________________ our own country.

3 . Chen Hui_________computer games, but now he gives them up and concentrates on study.

A．is used to playing

B．is used to play

C．used to play

D．is used for playing