— should teenagers spend at least 30 minutes taking exercise?—Five times a week,according to some reports.
.She got up to get some sleeping pills but found there was _________ left at home.
—He’s never sung French songs before, has he? —___________. It’s his second time to sing in French.
It’s difficult ______me to afford the car. And It’s generous ______you to help me.
—Peter doesn’t mind lending you his camera. —He _______. I’ve already borrowed one.
I never doubt _____ this exhibition is worth ________.