______ your sister ______ in Greener China for a long time?—Yes.She joined it five years ago.

Frank is my pen pal, he _____________ Sydney, Australia.

It’s not good for students to play _____ computer games.

What did Mr．Smith do before he came to China?—He in a car factory．

The opening ceremony of the 29th Olympic Games started ______ August 8thin the National Stadium in Beijing. [ ]