Most museums are just for looking. But today some of them have things for you to touch. The signs say, "________!"

__________at the door before you enter the office，or you’ll be considered impolite

 ____________ be late, or you will miss the exciting beginning of the speech.

Be sure_____ miss the concert .-- OK, I won’t.

___on the fast train heading northeast from Nanchang and five hours later you will hit Jingdezhen.