They were afraid that their oil and food would soon ______ if the help didn’t come in time.[ ]

Our city looks more beautiful!-Yes. Lots of trees and grass ______ sincelast year.

Readers are required to________the rules of thelibrary and mind their manners.

__ carefully if any change occurs when doing experiments in the lab..

14．The nunther of the students who took part in the competition____500，but only a small number ofthem chosen。