某重力式挡墙，墙重G=180kN，墙后主动土压力水平分力Exx=75kN，垂直分力Ev=12kN，墙基底宽B=1.45m，基底合力偏心距e=0.2m，地基容许承载力［σ］=290kPa，则地基承载力安全系数为（）。

A.0.8

B.1.2

C.1.4

D.1.6

用所给词的适当形式填空。

1. I can't choose which pair of jeans _______ (buy). They both look good on me.

2. Why do you look _______  (sleep)?

3. Everyone needs to have at least eight _______ (hour) sleep a night.

4. But we do think that our son needs to be _______ (real).

5. My parents have always taught me the _______  (important) of working hard.

6. Children shouldn't be allowed _______  loudly in class. (shout).

7. He should stop _______  (wear) that silly sweater.

8. It's probably a good idea for parents _______  (allow) teenagers to study in groups.

9. Do you think children should _______  (allow) to play computer games..

10. At our school, we sometimes have a special day _______  (help) others.