---I have great ___ in learning physics and I’m so worried. Could you help me?---Sure, I’d be glad to.
There is a policeman _____ the bus. He is watching the traffic.
—How long can I _____ the book? —For four days.
— _____ —Go down this street to the end.
Ms.liu often goes to school_____ a car.
The song I believe I can fly tells us that believing inis very important.