Plane will be very large _______ flying will be very cheap.
| A．and | B．so | C．but | D．or |
Studying in a foreign country is a different _________ and you can learn a lot.
| A．event | B．exercise | C．experience | D．exhibition |
Qinghai-Tibet Railway(青藏铁路) was completed last year. It is the __________ railway that connects Tibet with the other parts of China.
| A．first | B．second | C．third | D．fourth |
Sandra works in a big factory. She’s_________worker.
| A．a | B．the | C．some | D．/ |
China is developing _________ of all the countries in the world．
| A．fast | B．faster | C．fastest | D．the most fast |
A moment, please．I’m checking if Mr. Smith _________ free tomorrow．
| A．is | B．being | C．to be | D．will be |