В its educational value
C a very long history
D the number of the participants
E the symbol of peace and friendship
F the painting or drawing is always unique
G the central policy-making body
H the centuries-old tradition

1. C. 2. E. 3. B. 4. H. 5. G. 6. D.

Лишние: A; F.

1. a very long history

2. the symbol of peace and friendship

3. its educational value

4. the centuries-old tradition

5. the central policy-making body

6. the number of the participants