__________ pleasant experience it is! I think I won’t forget the tour to Xi’an for ever.
--- _______ 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 playingguitar 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.