4. Fill in: natural, animal, charity, staff, take care, couple of hours, foster, senior, burst, abandoned.

1. My best friend works as a volunteer twice a week at the animal shelter. 2. He is not a senior member. 3. He helps to take care of animals and feed them. 4. Some of the animals need more care than usual, so a foster home is found for them. 5. It is hard not to burst into tears when you see abandoned animals. 6. He sometimes goes to a charity event or visits a senior citizen for a couple of hours. 7. Volunteering is his natural choice.