We all went Tom. He had to stay at home.

You forgot your purse when you went out.— Good heavens, _______. [ ]

(2011·山东)He had his camera ready ________ he saw something that would make a good picture.

If the barrier of the earthquake-formed Tangjiashan lake _____, a big flood will be caused.[ ]

The air pollution is very serious,we shouldtake___________to stop it.