Thanks ________ your help.
_______is really difficult for them_______the mountain.
I like skiing better than climbing because I think climbing is ________ skiing.
It took me two weeks________reading the novels written by Guo Jingming.
---Tim played the guiter very well in the school talent show.---I think so.He practices________it every day.
---What about _______ a rest?---OK!Let’s go for a walk.