You didn’t wait for Elizabeth last night.did you ?— Yes. But we ______. She didn’t come at all.[ ]

______environmental damage is done，it takes many years for the ecosystem to recover

It is dangerous to allow the children who are ________ swimming in the river

deas are very interesting, but we need ______suggestions to get us out of the mess.

What do you think of the play?—— Terrible! I，ve never seen _____ one.