His landlady gave him a week's _____ to leave the flat.
| A．threat | B．notice | C．announcement | D．caution |
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 |
．The unemployment rate in this district______ from 6% to 5% in the past two years．
| A．has fallen | B．had fallen | C．is falling | D．was falling |
His suggestion ___they have a meeting to discuss the matter is reasonable．
| A．which | B．what | C．that | D．that what |