1．He gave her French lessons in exchange for her teaching him Chinese.
2．They are different from each other in hobbies and entertainment.
3．There is no living thing in the river because it is seriously polluted.
4．Your room is similar to mine, so they have much in common.
5．The street was crowded with people and the traffic was held up.
6．The terrible flood destroyed thousands of houses and made many people homeless.
7．The charity (慈善团体) offered a great deal of money and food to the homeless people.
8．The local inhabitants (居民) are all familiar with the famous writer.
9．With the development of tourism (旅游业), thousands of foreigners want to pay a visit to China.
10．What is your opinion (看法，观点) of the matter?
score is now well into double figures (数字)．
sation (文明) of mankind has taken thousands of years.
