I had not been reading for half an hour _____ I heard the steps outside.

    A. when                     B. while              C. as                          D. since

I'd like to tell you something more about the problem of pollution we are facing to. As we know, the factory besides our school gives off heavy smoke all day long. Very loud voices hurt our ears. Rubbish and waste are thrown here or there. It also sends out polluting water and poisonous gas. All this has made a great harm to the health and study of the teachers and students. But as time goes on, a little has done to change the situation. I don't think we could study well unless the problem is solved. We do hope you'll help and support us.

Dear Ralph,

I am an university student. I once thought life at the university must be excellent,

but now I changed my mind. I have three roommates, and I was the last one

to  move into the dormitory. Last term, I got along peacefully and happy. But I find

they are not willing to be with me now. They don’t talk with me, and they’ve

become cold toward me. Many time, I have wanted to talk with them about how I

felt like, but I failed to find an opening. When leaving alone, I always recall this

sadness. But I am an honest student. Why don’t I win true friendship?

____ he came back home that we knew what had happened .

A. When it was    B. It was when    C. Was it when    D. When was it

 Oh, Jack, _________________ you gave us!

A. How a pleasant surprise                                           B. How pleasant a surprise

C. What pleasant a surprise                                         D. What pleasant surprise      

.It was in the small house ___was built with stones by his father ___ he spent his childhood.                           

A. which; that     B. that ;where    C, which; which     D. that; which

---How far apart do they live? 

---??????????????????????????????????????________ I know ,they live in the same neighborhood.

A. As long as                     B. As far as                    C. As well as       D. As often as

 So_____ that all the living things died out gradually.

A serious polluted the lake is        B serious polluted is the lake

C seriously polluted the lake is      D seriously polluted is the lake

 —Do you know the town at all? 

— No, this is the first time I _________ here.

A. was                  B. have been          C. came             D. am coming

_______ from the top of the building when the policeman pointed the gun at him.

    A. Jumped down the robber　            B. Jumped the robber down

    C. Down jumped the robber　            D. Down the robber jumped