Young people always look into the future, while old people like to look back into the past. This is ______ both men and women.
When ____ different cultures, we often pay attention only to the differenced without noticing the many similarities.
we should exploit the Antarctic’s natural resources is open to discussion.
World Wide Web was invented in 1991 byEnglish scientist ,Tim Burners-lee.
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
-----Could you do me a favor and take these books to my office? -----Yes, _____.