Do you want to be healthy? ______. Smiling can help you stay healthy.

_____ carefully, Michael! There’s a school ahead.

Don’t open your books, _______?

— Excuse me, can you tell me the way to the Xinhua Bookstore?
— Yes.        down this road and turn left. It’s on Jiefang Road.

“________run in the hallways, Mike.”  "Sorry, Ms Clark.”
A. Don't             B.  Please        C. Let's

The teacher often says, “       play on the street after school. ”
Don’t  B. Don’t be    C. Not

______play computer games after school.

Do you want to be healthy? ______. Smiling can help you stay healthy.

 Please _______, they’re having a meeting.

Your sister is sleeping. Don’t ___________.