The Blacks ______ dinner when I knocked at the door.A. is having B. are having C. were having
---How many teachers are there in your school? ---I’m not sure about it. Maybe .
--What do you think of Pleasant Goat and Big Big Wolf (《喜洋洋与灰太狼》)?---It’s very . Many children like watching it.
Tom thanked his sister helping him his lessons.
---May I surf the Internet now? ---No,______ you have finished doing the dishes.
The young man used to _______ to work,but he is used to _______to work now.