Key to ExercisesUnit 1. Text A III. Vocabulary Activities1. 1) substituted 2) analogy 3)represented 4) associated 5) challenge 6) converted 7) concept 8) reduced 9) image 10) bundles 11) choose 12) pointed 13) instead 14) various2. 1) Home should be a place where people can get away from fear and danger. 2) Professor Valentine put together a reading list and asked her students to read all the articles on the list. 3) Jennifer is getting into fashion design. 4) A difficult task is far easier to finish if it is broken down into smaller, easier pieces. 5) After taking the medicine, the patient felt a good deal better. 6) Over and over again I told Steve to give up smoking, but he never listened to me. 7) Whether he can be hired or not will depend/depends on the job interview.IV. Usage 1. took 2. go 3. take 4. go 5. goV. Structure 1. what caused he fire 2. what size of shoes my father wears 3. what looked like a ball 4. what our family and friends do for us 5. what she had bought for his birthdayVI. 1. What the boy likes to do most is putting together building block.2. In term of previous experience, John is the best choice for the position. 3. My physics teacher often uses analogy to explain some difficult concepts.4. With the help of his family and friends, Tom build up his publishing business bit by bit.5. Linda was not able to go to that famous university, but she planned to start all over again rather than give up the challenge.6. This company has a very good public image. People always associate its product with high quality and good service.vText BExercise I 1. recognized 2. later on 3. fall back on 4. slightest 5. alternative 6. figure out 7. convinced 8. complicated 9. struck terror into 10. oral 11. sound 12. Follow 13. doubts 14. masterUnit 2Text A. III. 1. 1) back and forth 2) destination 3) terminals 4) distinction 5) are not supposed to 6) bet 7) rotten 8） racial 9) board 10) inexpensive 11) delight 12) ride13) pretended 14) increasing 15) valuable 2. 1） come up with 2) turned out 3) hold on to 4) take over 5) picked up speed 6) head forIV. 1. reboarded 2. invaluable 3. inarguably 4. interracial 5. unlikelyV. 1. On the table were some flowers. 2. Many a time have I climbed that hill. 3. Only in this way can we solve the problem. 4. So many times has Mother told you to go to bed before 10 oclock. 5. No better person can I think of for this job.VI. 1. The children are pretty annoyed that their parents wont allow them to play around the railway track.7. I bet if I pick up a little speed I will reach the destination sooner than they do.8. You dont want to go out in such rotten weather. Its better for you to stay home and stretch your legs and do physical exercises.9. Its half past ten, and youre not supposed to be sleeping! Its time to head for the airport to pick up your cousin!10. Who came up with the idea to ask Mike to take over the project?11. The school makes no distinction in treating students from different racial backgrounds.Text B. I. 1. oversleeping 2. disappointed 3. grades 4. parental 5. figure 6. fuss 7. have it in for 8. sack 9. attitude 10. come by 11. changedII. 1. 有趣的是，当我们年龄渐长的时候，我们对父母的看法会改变。2. 他们逼着我们吃蔬菜，我们还不想睡就逼着我们上床，对我们的成绩大惊小怪，教训我们这一切都是因为他们真的爱我们。3. 当我转弯要开过他的房子时，我看到一个身影站在寒天的雨中，手中拿着一个袋子。4. 是表达感激之情的时候了。感谢父母的爱，感谢这世界上最纯真的爱。Unit 3Text AIII. 1. 1) mechanic 2) confused 3) qualified 4) interview 5) scarce 6) outstanding 7) severe 8) license 9) elementary 10) transferred 11) praise 12) arrive13) is settled 14) officially 15) roll 2. 1) close down 2) mop up 3) get by 4) out of question 5) talkover6) get in the wayIV. Usage1. Traveling around the globe by air 2. Eating more apples and vegetables 3. Going to work on foot4. Saving energy5. Learning to ride the bicycleV. Structure1. The train pulled into the railway station as soon as arrived there.2. As soon as they reached the top of the mountain, it began to rain cats and dogs.3. As soon as the door opened, the bird flew out into the sunshine.4. As soon as the bus stopped at the station, the thief jumped off and ran away.5. As soon as she saw the Statue of Liberty, she realized that she was already in the United States.VI. Translation1. He is a qualified mechanic, but he winds up with a job in international trade.2. He enrolled in an elementary computer-training program in his spare time but failed to get through.3. After the interviews, the principal chose several outstanding university graduates to work as teachers.4. This contract is very important to our company. The more concrete it is, the better.5. The boy suffers from severe leukemia and has to be transferred to a big hospital for further treatment.6. When he heard that the school