--Who______ it be that is knocking at the door?--It ______ be Father, but I’m not sure.
.China has a well-known ballet which is called_____.
In the painting,a young woamn sits____,_____in thought.
I don’t like the way____you talk to your mother,you must change____way.
If you keep_____,you can sit on _____side of the boat.
around the famous museum, we were taken to visit the Theme Park about five kilometers out of the city.