— I can’t decide __________or not I should encourage my son to be a volunteer.— Why not? It will make him more helpful.
—Don’t _________ time talking to him. He won’t change his decision. —I agree with you.
The light in the room was _____, but nobody was in.
--Could you please _____ in the room? --Oh, I’m sorry.
_____ have you been swimming? For five years.
---He’s never been to an aquarium. ---_______.