I had walked a few steps _______ I realized that I was lost in the thick fog.
| A．unless | B．Before | C．When | D．since |
Traffic is bad, ________ in the city center during the rush hours.
| A．particularly | B．terribly | C．mostly | D．normally |
Paper produced every year is __________ the world’s production of vehicles.
| A．the three weight of | B．three times the weight of |
| C．as three times heavy as | D．three times as heavier as |
The plan to be carried out next month needs________among the members of the labor union before________.
| A．to discuss；carrying out | B．to be discussed；carried out |
| C．discussing；being carried out | D．discussed；to be carried out |
It is impolite to sit there with your feet _____ at somebody.
| A．pointing | B．pointed | C．being pointed | D．point |
Sam________some knowledge of the computer just by watching others working on it.
| A．brought up | B．looked up | C．picked up | D．set up |