World leaders have to face the fact that ________ global warming has become perhaps ________ most complicated issue.
| A．/；the | B．/；/ |
| C．the；the | D．the；/ |
The young man did nothing but ___ in the street like a spirit all day.
| A．wander | B．to wander | C．wandering | D．to be wandering |
The old __.
| A．have to take good care of | B．was looked after very well |
| C．have to be taken good care of | D．were had to look after very well |
___ you’ll miss the train.
| A．Hurry up, and | B．Be quick, or | C．Unless you hurry up, or | D．If you not be quick |
I paid __ money that I borrowed from him there years ago.
| A．twice as many as | B．twice the size of | C．twice the amount of | D．more than twice |
He managed to make himself ___ with his ___ Englsih.
| A．understand… breaking | B．understand..broken | C．understood…breaking | D．understood..broken |