Going to America for further study is a good chance , ____ I have been looking forward to . 

Some people prefer to work and live in Chengdu, for the price of an apartment is less than half of ________ of big cities like Beijing, Shanghai, and Guangzhou.

--- Who helped you clean the classroom yesterday? --- _______. I cleaned it all by myself.

---What do you think of these two books?---_________ of them are interesting. And I’ve read them several times.

 Tom told me that he needed a chair and that soon he found ________.