—Must we clean the classroom now?—No ,you _______.

—Could I keep this book for another week?—Of course you        .

—Are you coming to Jeff's party?—I'm not sure.I ________ go to the concert instead.

— Li Lin hasn’t turned up yet, but he promised to come to the party.— He ______ home. He is a man of keeping his word.

—The government should try to balance economic growth and pollution from industry.—____. It’s time to do it.