We had fun __________ in the lake last Sunday.A. boat B. boating C. boated
--- _______ will the fog and haze(雾霾) last? ---I have no idea. There is no sign of an end.
Many old people _________ his age die _________ cancer.
Look, the old man who is playing guitar is university teacher.
_____, I practice speaking English in the park. The air there is very fresh.
The winter holiday will begin soon. John _____ to stay with us.