. Some people say more but do less ______ others do the opposite.
| A．once | B．when | C．while | D．as |
The dam will generate electricity _____ about 40 million tons of coal without causing so much air pollution.
| A．equal | B．be equal | C．equal to | D．be equal to |
Mencius believed that the reason why man _____ the animals is that man is good.
| A．is similar to | B．is different from | C．are clever than | D．are kind to |
Strong sandstorms are often _____ you cannot see the sun.
| A．so thick that | B．such thick that | C．thick in order that | D．thick such that |
He then moved to London, _____ he became famous.
| A．which | B．when | C．where | D．why |
One third of the class _____ agreed to be volunteers to help the aged this vocation.
| A．are | B．is | C．has | D．have |