More and more high－rise buildings have been built in big cities ________ space.(2010·福建)

Did your father come back early last night? — YesIt was not yet eight o’clock ____ he arrived home[ ]

Would you please ___your radio a little I can hardly go to sleep. — Oh, sorry.

The first few years in the 21st century ______ therapid rise of China as a world economic power

__ some more chairs，tables and so on, the room looked more beautiful.