选择括号内恰当的单词或词组填空，使句意完整—— （Which , Whose）schoolbag is that?
——It’s Tom’s.—When did you hear the news?
—I know nothing about it （until , after）my friend told me.One of my friends （are , is）a doctor.
My mother is feeling （badly , terrible）. She must have a cold.
We’re OK. Don’t （worried , worry）about us.