–When did he come back last night? --It was at 8 o’clock ________ I was watching a documentary on TV.
The pencil fell off the table and went _______across the floor.
Bill suggested________a meeting on what to do for the Shanghai Expo during the vacation.
S cientists have many theories about how the universe________into being.
As the air is being polluted,many kinds of wild animals are________.
Although the wind has________,the rain remains steady,so you still need a raincoat.