Can you see the boys _____ football on the playground? They are my classmates.

_____ to work, Bob bumped into an old friend, David, who he hadn’t seen for years.[ ]

Oh, Mrs. Black, your wallet looks nice, is it new?—No, I ________ it for two years.

Can you tell us __________ just now?—Sorry, I don’t know.

Which of the two cameras are you going to buy?—I’ll buyof them，so I can give one to my friend．