There goes the bell for the class.Let’s stop___.

A. to talk   B. to be talking   C. talked   D. talking

This is the only one of the books on space ___.

A. that has been written   B. that have been written   C. which have been written  D. which has been written

--Who has opened the door?  ---I think it __ be Lin Tao. He’s always the first to get here.

A. is able to   B. can't    C.must    D.mustn’t

____in faraway northwest , this place has its beautiful fresh air .

         A．Being located   B．Located    C．locating    D．To be located

The soldier was ____of running away when the enemy attached.

         A．scolded      B．charged     C．accused     D．punished

--- I am going downtown.  

--- Come on. _________.

A. Don't do that.  B. You are welcome.  C. Come with me. D. I'll give you a lift.