252. One of the purposes of United Nations is to achieve international co-operation without distinction as to race,____, language or religion.
| A．sex | B．female | C．male | D．Skin |
A harmonious society is like a symphony — each person contributes a small sound, but when __with other sounds, it becomes beautiful music.
| A．combining | B．combined |
| C．being combined | D．to be combined |
___________________ to sunlight for too much time will do harm to one’s skin.
| A．Exposed | B．Having exposed | C．Being exposed | D．To expose |
With her health ____________________, she had to quit the job she loved.
A. broken down B. broke downC. having broken down D to break down
She is popular among her classmates, ________________ she can be annoying at times.
| A．in case | B．as if | C．even if | D．so that |
— Margaret _____________ stay at home all day long in front of the computer.
—That' s right．She should go to the fitness center with us.
| A．doesn’t have to | B．couldn’t | C．oughtn’t to | D．may not |