Look! A book is on the floor. Whose is it?—It ______be Rick’s. It has his name on it.

Is the street too narrow for the bus to go ___? [ ]

Can you tell me ___ it is from here to the history museum?— It’s about half an hour’s walk.

Most doctors and nurses ______ white clothes when they’re at work..

The number of giant pandas is getting _________ because their living areas are becom­ing farmlands.