The key answer of exercise 7

a)

1. D
2. A
3. F
4. C
5. E
6. B

b)

1. To solve the problem of war we could send UN negotiators to help sort out problems between the two countries.
2. To solve the problem of poor sanitation we could build sewers, provide a clean water supply and clean up rubbish.
3. To solve the problem of homelessness we could provide more homeless shelters.
4. To solve the problem of racial discrimination we could teach people to be more tolerant.
5. To solve the problem of illiteracy we could build more schools and provide more teachers.
6. To solve the problem of famine we could support more charities and help people to grow drought resistant crops.