Answer key for Exercise 1：

­(en)ce un­ present

violent

confident

different

patient presence

violence

confidence

difference

patience certain

fair

paid

like

kind uncertain

unfair

unpaid

unlike

unkind ­al ­ist culture

globe

universe

agriculture

mathematics cultural

global

universal

agricultural

mathematical art

physics

chemistry

biology

science artist

physicist

chemist

biologist

scientist 　　Answer key for Exercise 2：

　　1C　2A　3C　4B

　　Answer key for Exercise 3：

　　fundamental，astronomy，gave birth to，existed，As a result，atoms，prevents...from，puzzle

Emotional words Calm words violent angry rude

shocked excited crazy patient gentle relaxing

kind easy­going calm 　　Discovering useful structures

　　Answer key for Exercise 2：

　　1 What has not yet been proved is his discovery.

　　2 Whether the other astronomers accept his ideas remains a question.

　　3 How life first appeared on earth is still a mystery to scientists.

　　4 Why the earth is becoming warmer is an important topic for research.

　　5 It amazed everybody that Stephen Hawking at 65 experienced zero gravity during a flight.

6 It is a surprise that Pluto is no longer considered a planet in our solar system.