30.We investigated other companies in the market to find out they would handle complaints fromtheir customers.

1 15. Virtue and vice are before you； leads you to happiness, to misery.

1 14. Human behavior is mostly a product of learning, whereas the behavior of an animal depends mainly on .

113.The whole world is now clearly aware of theto which global warming has affected the earth.

112.Detectives are trying hard to find out theof the man killed in the traffic accident.

111.Students must take performance tests at monthlyin some advanced courses.

1 10. They were under thethat the company was doing well, but in fact it was in serious trouble.

109.We＇ cl like to make anwith your manager to further discuss the contract.

108.At the time of economic crisis, he could only earn aof $200 per month.

107.After climbing for two hours, we were glad to take rest.

106.She ismother.