1 Behaviorists suggest that the child who is raised in an environment where there are many stimuli which develop his or her capacity for appropriate responses will experience greater intellectual development.
2.Even when we turn off the beside lamp and are fast asleep，electricity is working for us，driving our refrigerators，heating our water，or keeping our rooms air-conditioned.
3.Aluminum remained unknown until the nineteenth century，because nowhere in nature is it found free，owing to its always being combined with other elements，most commonly with oxygen，for which it has a strong affinity.
4. It is probably easier for teachers than for students to appreciate the reasons why learningEnglish seems to become increasingly difficult once the basic structures and patterns of the languagehave been understood.
5.Insects would make it impossible for us to live in the world；they would devour all our crops and kill our flocks and herds，if it were not for the protection we get from insect-eating ◎animals.◎
6.All they have to do is press a button，and they can see plays，films，operas，and shows of every kind，not to mention political discussions and the latest exciting football match
7.We all know that China is still a developing country and its education
still lags behind that of developed countries.
8.In the case of both Napoleon and Hitler,they won many victories,which led them to believe that anything was possible and that nothing could stand in their way.But Russia's icy defender proved them wrong.
9.Making a living as a door-to-door salesman demands a thick skin,both to protect against the weather and against constantly having the door shut in your face.
10.The workers who gets a promotion, the student whose grades improve, the foreigner who learns a new language-all these are examples of people who have measurable results to show for there efforts.
1.The task was finished by our group.
2.Are you finished with your breakfast?
3.Are you listening to me carefully?
4.My hobby is listening to music.
5.My job is teaching .
6.I am teaching now.
7.My dream is traveling around the world.
8.During the summer holiday , I was traveling in Nepal.
