5. 　 The black ____in the United States before the Civil War.

　 A.looked on as　 　　　　　　　　　　　　　　　　　　　　 B. were looked on as

　 C.were looked down upon as 　　　　　　　　　　　 D. were looked down upon　

4. 　 -why are they taking all the equipment away?

　 -The job _______, they are packing up to leave.

　　　 A. done　 　　　　　　　　　 B. being done 　　　　　　 C. was done　 　　　　　　 D. having done

3. 　 You see robots ________ around your home every day although you may not have thought of them as such.

　 A. at work　 　　　　　　　 B. to work　　 　　　　　 C. in work　 　　　　　　　 D. on work

2. 　 Every morning he received bread ________ from the best flour.

　　　 A. prepared　 　　　　　　 B. worked　 　　　　　　 C. done　 　　　　　　　　 D. prepared for

从A、B、C、D四个选项中选出可以填入空白处的最佳选项。

1.　 -I think we should paint wall white.

-Yes. It looks a bit ugly _______ it is.

　　　 A. as　　 　　　　　　　　　 B. what　　 　　　　　　 C. where　　 　　　　　　 D.since