Correct the mistakes in the relative clauses

1 In our town, there were many people WHO did not care about the environment.

2 I enjoyed visiting the nature park WHICH you recommended.

3 I still remember the man WHO taught me to climb trees when I was a little boy.

4 The scientists WHO appear on national television are often amateurs.

5 People WHO  work for the hunger program say that thousands of people worldwide die from starvation every single day of the year.

6 While the boy was at the Askania Nova Reserve, he took many pictures of zebras WHICH were roaming in the steppe.