sometimes look at books about different machines and try to design perfect working machines.

architect He learnt to design whatever his employer wanted: cities, canals, bridges or weapons. I am interested in modern architecture.

teacher He set out to write the first systematic explanation of how machines worked and how the parts of a machine were combined in the whole. I love children and enjoymaking friends with them.

doctor His talent was so rare that he mastered any subject to which he turned his attention. I feel merciful for those sick people who suffer great pain.

inventor a. He came up with numerous designs based on the gear.

b. If he had never been a painter, we would still appreciate him as one of the greatest inventors of his time. No time spent on making inventions.

scientist He might have been a scientist if he had not been so skilled in other areas. Maybe there will be some evidence after I graduate and major in certain subject in the university.

T: Well, you may like or dislike some subjects. However, I firmly believe all of you have certain natural ability in some areas. You can offer more evidence to fill in the chart after class. But now, let's have a discussion about the questions in Exercise 3. Now, work with your partner and I'd like some of you to show your opinions.

Five minutes later.

S1: Leonardo managed to earn his living in two ways, i.e. by painting pictures and designing cities, canals, bridges, weapons, bicycles, helicopters, automobiles and some working machines. I am only familiar with the way of painting because I am interested in drawing pictures and I enjoy painting myself. As a girl, I am least happy with the knowledge of machinery and I am a bit worried about it because with the development of modern industry, more and more advanced machines will be produced and I will fall behind the times if I don't try to know some information about them. I will read more books and go to visit workers in the factories so as to learn more about how modern machines are designed and how they work.

S2: Unlike Leonardo, who was very good at drawing skills and made a living partly by them, I have no talent in painting. However, I know something about the design of bridges, bicycles and automobiles, by which Leonardo once earned his living. I am least happy with the knowledge of drawing and I am very worried about it because I have to develop the skills of drawing if I decide to learn more about the design of bridges, bicycles and automobiles. I have to learn from my art teacher and practise drawing lines and figures every week in my spare time so that I can have a better sense of drawing and designing certain products.

S3: Leonardo used to earn his living by painting pictures and designing cities, canals, bridges, weapons, bicycles, helicopters, automobiles and some working machines. I am familiar with painting pictures because I took an interest in it when I was a boy, but I am least happy with designing cities, canals and weapons. I'm rather worried about it because they are very important skills for us to live a healthy and peaceful life. I decide to learn more about geography and history so as to make our cities