____ I admit the problems are difficult, I don’t agree that they can’t be solved.
| A．Until | B．While | C．As | D．Unless |
—He should have been warned of the danger.
—_____, but he wouldn’t listen to me.
| A．Yes , he shouldn’t | B．So he should | C．So was he | D．So he was |
I’m not a little tired today after giving the room a thorough cleaning .I have never had ____ today.
| A．as tiring a day as | B．as a tiring day | C．tiring as a day as | D．day as a tiring as |
In face of failure, it is important to ______ a good state of mind.
| A．keep up | B．keep on | C．keep out | D．keep off |
In the ten days _______ New Year's Day, revelers within the Fifth Ring Road ______ to set off firecrackers from 7 a.m. to midnight.
| A．following, are allowed | B．followed, allow |
| C．following, allowing | D．followed, have allowed |
—He is fluent in English because he once stayed in London。
—Really ?How long ____ there ?
| A．did he live | B．has he lived | C．had he lived | D．does he live |