Different colours usually stand for different feelings. Red, for example, is the colour of fire, heat, blood and life. People say red is an exciting and active colour. They associate( 使发生联系 ) red with a strong feeling like 1 . Red is used for signs of danger, such as STOP signs and fire engines. Orange is the bright, warm colour of 2 in autumn. People say orange is a lively colour. They associate orange with happiness. Yellow is the colour of 3 . People say it is a cheerful colour. They associate yellow too, with happiness. Green is the cool colour of grass in 4 . People say it is a refreshing colour. In general, people 5 two groups of colours: warm colours and cool colours. The warm colours are red, orange and 6 . Where there are warm colours and a lot of light, people usually want to be 7 . Those who like to be with others like red. The cool colours are black and blue. Where there are these colours, people are usually worried. Some scientists say that time seems to 8 more slowly in a room with warm colours. They suggest that a warm colour is a good way for a living room or a 9 . People who are having a rest or eating do not want time to pass quickly. 10 colours are better for some offices if the people working there want time to pass quickly.