I ______ a set of keys. Are they your keys, David?
| A．look | B．spell | C．lost | D．found |
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 |
—Is Jessica giving us a speech this evening?
—No, it _________ be her．She _________ to Japan．
| A．mustn’t；has gone | B．mustn’t; has been |
| C．can’t; has gone | D．can’t; has been |