III. Give the correct forms of the words in brackets.
1. Nick thinks mountain climbing is more (challenge) .................................... than collecting things.
2. My father has an (usual) .................................... hobby.
3. (Carve) .................................... eggshells can be used as gifts for families or friends.
4. (Obese) .................................... can increase the risk of heart disease.
5. Living conditions in the slums are very (health) ....................................
6. This is (environment) .................................... friendly washing powder.
7. We arranged to meet in (receive) .................................... at 6.30.
8. A (health) .................................... body will be able to fight off the (ill) .................................... (nature) .................................... without the use of medicine.
9. A good diet is (benefit) …………………………… to health.
10. She often donates money to (charity) ................................... (organize) ...................................
11. The heart transplant will take place as soon as a suitable (donate) ................................. can be found.