3.The population of China 1.3 billion, and 80% of the population farmers.

97.Modem fanning methods may have an adverseon the environment.

96.I＇d like to take of this opportunity to thank you for your hospitality during my visit.

95.of them knew about the plan, because it was a top secret.

94.When we finished dinner, Mr. Smith asked the waiter to bring him the .

93.They plan to move to the countryside because the air there is much fresher than in the city.

92.Mary asked Joe and Jim to go on a picnic with her this Sunday, butof them can, because theywill have to work.

91.It is believed that too muchto the sun is harmful to the skin.

90.Although I have read the book assigned by the professor several times, I still can＇t make anyofthe last chapter.

89.It is very convenient for me to go to work every day because the bus runs.

88.London has a larger populationin the United Kingdom.