At last he _____ finish the work ahead of time.
| A．could | B．was able to |
| C．could be able to | D．can be able to |
The USA and some other countries helped the rebels in Libya ______ their promise to support democracy and fair trade.
| A．in danger of | B．in memory of | C．in peace for | D．in return for |
The elderly ______ good care of in public places like supermarkets and airports; they are likely to get lost.
| A．can have been taken | B．ought to be taking | C．must be taken | D．should take |
Children need to feel ______ in order to do well at school.
| A．secure | B．fun | C．popular | D．threatened |
In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ______ we have never experienced before, ______ makes us worried a lot about nature disasters.
A. A. that; that B. as; which C. which; it D. when; as
The computer is absolutely ______ amazing technological revolution. Just imagine what ______ fun it is playing computer games over the weekend!
| A．the; the | B．an; 不填 | C．不填；a | D．an; a |