当不知道笼子里的是什么动物时,你可以问:________A.What's this? B.What time is it?
Mr Green is a new teacher at our school. His job is __________.
_______ weather we are having these days!
----I am very sorry but I can't help you now. ----_________.
There are about six bridges over Yangtze River in Jiangsu. One is for trains, __________ are all for cars and tricks.
Do you know___________?