World Wide Web was invented in 1991 by English scientist ,Tim Burners-lee.
| A．\; an | B．The; an | C．The; the | D．A; the |
What do you think of the reason _____ he gave at the meeting yesterday?
| A．why | B．for which | C．that | D．in which |
Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．when |
Every minute must be made full use of ____ our lessons, for the final examination is coming.
| A．going over | B．to go over | C．go over | D．to going over |
The foreigner does speak Chinese well, but of course not _____ we Chinese.
| A．as fluent as | B．more fluent than | C．so fluently as | D．much fluently than |
The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.
| A．how | B．which | C．why | D．because |