I don’t think teenagers should drivecars.— . They aren’tserious enough.

(2013·高考天津卷)No one ________be more generous; he has a heart of gold.

Are you still busy—Yes, I ___________, and it won’t take long.

Ann is in hospital.— Oh, really? I _____ knowI _____ go and visit her.

People have birthday cakes ________ candles ________ their birthday.