—Hey! What's the rush?
—The plane ________ at 4∶00 and I need to see my uncle off.
| A．takes off | B．will take off | C．has taken off | D．took off |
There is a shortage of teachers in Western China, and it will fall on the 80s and 90s generations to this responsibility.
| A．take on | B．step up | C．make up | D．apply for |
Only when he told me________what trouble he was in.
| A．did I realize | B．I realized | C．do I realize | D．I realize |
There are a number of methods to provide relief from your toothache, which can’t cure the problem.
| A．permanent | B．temporary | C．contemporary | D．consequent |
____ I'm mistaken, I've seen that tall man at a party before.
| A．If | B．As | C．Unless | D．When |
Paper produced every year is ________ the world’s production of vehicles.
| A．the three times weight of | B．heavier three times than |
| C．as three times heavy as | D．three times the weight of |