长时间看电脑屏幕可能对你的眼睛有害。

Looking at a computer screen for too long can ___be ___bad ___for your eyes.

我避免长时间玩电脑，因为它对我的眼睛有害。

I avoid playing on the computer for long because it ___is ___bad ___for my eyes.

吸烟对你的健康有害。

Smoking ___is ___bad ___for your health.