25.There can be no doubtsomeone had visited the house before they arrived.

120.The little girl was left alone, withto look after her.

1 19. In previous times, when fresh meat was in short, pigeons were kept by many households as asource of food.

118.Housewives who do not go out to work often feel they are not working to their full .

117.He has failed me so many times that I no longer place anyon what he promises.

1 16. People have to makefor their old age by putting aside enough money to live on when old.

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.