Here are the correct forms of the words in brackets:

1. People admire his **donations** for the community. (donate)
2. I think we should help **homeless** people in our town. (home)
3. He thinks that mountain climbing is more **challenging** than collecting things. (challenge)
4. Don’t eat **unhealthy** food because it will be harmful to you. (health)
5. A **birdwatcher** is someone who enjoys watching birds. (bird-watch)
6. Let’s bring **happiness** to children every day. (happy)
7. You should wash the fruits **carefully** before eating them. (care)