-Is that your best friend Kitty?- No, it _________ be her. She flew to Singapore yesterday.
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.
You should _______ in the dictionary when you meet a new word.