2. Using Words and Expressions Answer key for Exercise 1 ： BC ， division ， skilful ， looked ahead ， spear ， systematic ， wrinkled ， hammer, dizzy Answer key for Exercise 2: 1.scratches 2. gay 3. alternative 4. Arrested 5. howl 6. spat

3. Suggested answers to Exercise 3: 1. I love to mix my yogurt with strawberries ， melon or other fruit to make it taste more delicious ． 2. Scientists did not recognize the significance of radioactivity until Madam Curie used it to develop X-rays ． 3. Harry's pulse raced when he saw the huge beast and immediately he accelerated his car out of the jungle ．

4. 4. The first few photos in my family album were taken when I was in kindergarten ． 5. I always knew that she was fed up with being a receptionist ． 6. The audience applauded the performance of the skilful skateboarding athletes for a couple of minutes ．

5. 7. The expert said the use of tobacco dated back to 1000BC ． 8. I think you need to delete unnecessary repetition from your article and check your punctuation before you hand it in ．

6. Answer key for Exercise 1 ： Using Structures 1. What have you been doing lately? 2. Oh ， really? Did you find it valuable? 3. Will you continue it for a second year then? 4. Don't they offer some scholarships if you're a good student?

7. Answer key for Exercise 2 ： has increased ， were discovered ， would be ， had been put ／ placed ， became ， comes ， puts ， was…surprising ， were taken ， were ， seems ， will remain

8. Exercise 3 ： Sample dialogue: S 1 ： Hello ． May I help you? S 2 ： Yes ， I am just wondering if you know anything about the terracotta warriors ． They look so impressive ． S l ： Yes ， they are ， aren't they? You know that they were made in the time of Emperor Qin Shihuang? S 2 ： Really! Was he a good Emperor?

9. S 1 ： Well ， he unified the country and set up the systems for writing ， weights and money ． But he was very cruel ． S 2 ： Oh dear ． What a shame! His soldiers look so splendid ． S 1 ： Yes indeed they were and very brave too ． The Emperor wanted them to be buried with him when he died ．

10. S 1: But his advisers told him that ， if he did that ， his kingdom would be conquered immediately, so he decided to bury soldiers made of clay instead ． S 2: Made of clay? Were they painted? S 1: Yes ， they were ． Each warrior had his own face copied ， but the bodies were all made the same ． S 2 ： I see ． Thank you so much ． I have learned such a lot from you!

11. writing task writing task Sample writing ： The first to be built was Pyramid No B. It has steps up the side, and it looks as if it was an attempt to build something that we now call a pyramid shape ． The steps were a way of organizing the building and making sure that it was safe ．

12. The steps look as if smaller and smaller boxes were placed one on top of the other to make the step design ． I think the second to be built was Pyramid No C ， which bends at the top ． It has smooth sides which the architects could have learned from building the step pyramid ． But the design is clearly not finished as the curve at the top of the pyramid is not smooth.

13. The Egyptian architects have not yet completely mastered the art of building pyramids with smoothly sloping sides ． I think the third to be built was Pyramid No A ， which has smooth and evenly sloping sides ． It is the shape that we call “a pyramid shape” today, so it must be the final one in this series of buildings ．

14. From the pictures we can see that the three pyramids all come to a point at the top ． It is reasonable to assume that the pharaoh ／ god was close to the other gods ． The pharaoh’s spirit could escape from the top of the pyramid and fly up to the sky ， where the gods were thought to live ．