When you get on a bus, it’s polite to wait for ________ turn. 

_______ boys in my class can ski but _______ of them can do as well as Jim does.

–Excuse me, Mr. He, are you free? Lin Tao and I want to tell you _____.     –Sure.

Last winter it was very cold and ________ was a lot of snow in the north.

—How many computers are there in the room?—__________. Some workers moved them to another place just now.