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

2 . The doctor advised my father to give up drinking. He said that too much drinking is ________ his health.

A．good for

B．harmful to

C．busy with

D．full of

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

4 . We know that drinking too much is h________（有害的）to our health.

5 . Reading in the sun is ______(有害的) to your eyes.