The teacher asked more _____ to prevent the students’ eyes from being injured.
| A．to do | B．done | C．to be done | D．being done |
You shouldn’t go out without a coat , it’s rather cold .
| A．unless | B．even though | C．however | D．since |
When ____ different cultures, we often p
ay attention only to the differenced without noticing the many similarities.
| A．compared | B．being compared | C．comparing | D．having compared |
we should exploit the Antarctic’s natural resources is open to discussion.
| A．What | B．Whether | C．If | D．That |
World Wide Web was invented in 1991 byEnglish scientist ,Tim Burners-lee.
| A．\; an | B．The; an | C．The; the | D．A; the |
What shall we use for power when all the oil in the world has ____ ?
A. given out B. put out C. held up D used up