动名词作主语：
1、Smokingisprohibitedhere.
2、Climbingmountainsisreallyfun.
3、Doingmuchexerciseisgoodtoourhealthy.
4、Readingisanart.
5、Don'tputyourbikeontheplayground.
6、Pleaseqivemeahand.
7、Milkisgoodforyourhealth.
8、Pleasedoyourhomework.
9、Listeningtothemusicisgood.
10、Throwinglitteraboutisverybad.
