Since everyone would like to find an apartment near the university, there are very few ________ apartments in the area．

A．free

B．empty

C．vacant

D．reserved

Generally speaking, the bird flying across our path is observed, and the one staying in the tree near at hand is ________ by without any notice ________ of it．

A．passing; taken

B．passed; taken

C．passing; taking

D．passed; taking

Think carefully before you answer questions online．You may be ________ into giving away very important personal information．

A．caught

B．addicted

C．seized

D．trapped

We could go to a concert ________ you'd prefer to visit a museum．

A．if

B．because

C．unless

D．since

The reason why he was thrown into the prison by the police, it ________ , was that he was involved in a lot of murders last year．

A．was turned out

B．turned out

C．being turned out

D．was being turned out

James has just arrived, but I didn't know he ________ until yesterday．

A．will come

B．was coming

C．had been coming

D．comes?

Especially in Brazil, the Negroes have played ________ most important role in the development of the nation, but they are still living on ________ poverty line．

A．the; the

B．a; the

C．a; 不填

D．the; 不填

Not until the train pulled into the station ________ that his suitcase was gone．

A．did he find

B．had he found

C．he had found

D．he found

He was educated at the local high school, ________ he went on to Beijing University．

A．after which

B．after that

C．in which

D．in that

This problem is said ________ three times．

A．having discussed

B．to have discussed

C．having been discussed

D．to have been discussed