Some weak bridge may not ___ in an earthquake.
A,stay up B. fall down C. fell down D. fell off
．The two brothers look so much ___ that we can’t___ one from the other．
| A．familiar, separate | B．familiar, tell |
| C．alike, differ | D．alike, distinguish |
For some time now, Chinese people under the leadership of CPC____ the contents of Scientific Development Theory in the course of practicing socialism in China．
| A．had been improving | B．have been improving |
| C．were improving | D．improved |
I had just stepped out of the bathroom___ I heard the steps．
| A．while | B．when | C．since | D．after |
．After the new technique was introduced, the factory produced___ in 2001 as the year before．
| A．as twice many machines | B．twice as many machines |
| C．as many machines twice | D．twice many machines |
．—I did not know you were good friends．
—You___．I have known her since she moved here．You were abroad then．
| A．may have | B．needn’t have | C．couldn’t have | D．must have |