Here are the correct forms of the words in brackets:

1. Rossie has a large **collection** of stamps from foreign countries. (collect)
2. Fruit and **vegetables** are good for our health. (colour)
3. The Japanese eat **healthily**, so they have high life expectancy. (health)
4. Drinking unclean water can cause **sickness**. (sick)
5. Many people have become **vegetarians** because they believe it’s good for their health. (vegetable)
6. A hobby is an **activity** that you do for pleasure. (act)
7. At this school fair, you can exchange **used** paper for notebooks. (use)
8. Did you read books to the **elderly** in the nursing home last Sunday? (elder)
9. The city council is **responsible** for keeping the streets clean. (responsibility)
10. Susan is very **creative** and she paints very well. (create)