﹣Why are the windows so dirty?﹣Because we __________ them for a long time.A. have cleaned B. haven’t cleaned C. didn’t clean
The Kings ____ Beijing at ten last night.
— Can you see ____ sheep eating grass on the hill? — Sure I can.
— We have known something about the accident, but we need more ____. Can you help us? — Yes, sir.
Our neighbours are so kind that they often give us a ____ when we are in trouble.
The Sydney Opera House is like a huge sailing boat with water ____ three sides.