1 . Smoking is h________ (有害的) to your health. You’d better stay away from it.

2 . Junk food is ________ to your health. You’d better not have it.

3 . 吸烟对吸烟者和不吸烟者都是有害的。
Smoking is ________ smokers and non-smokers.

4 . 我们都知道，吃太多甜食对我们的牙齿是有害的。

As we all know, eating too much sweet food is ________________________ our teeth.

5 . —Don’t lie in bed like that. It will ________ your eyes.
—Thank you. I won’t do it again.

A．be weak in

B．be suitable for

C．be harmful to

6 . 众所周知，污染对我们的健康有害。
As we know, pollution is ________ ________ our health.

7 . —I’m sorry for having taken your pen by mistake.
—It doesn’t matter. Your pen ________ mine.

A．is similar to

B．is harmful to

C．is used to

8 . Books that are h______（有害的）to children shouldn’t be sold at any bookstore.

9 . Eating too much sugar can be bad for your teeth.（改为同义句）
Eating too much sugar can be ________ ________ your teeth.

10 . 塑料袋对环境有害，所以我们应该用布袋来代替塑料袋。
Plastic bags are ________________ the environment, so we should use cloth bags instead of them.