For Question 2, the best answer that meets conventional English standards is:
tutor after school, work in soup kitchens, or work to improve the environment.
This option correctly uses the conjunction "or" to indicate that each activity is an alternative.
For Question 3, the best answer is:
they feel better about themselves, learn more skills, gain valuable experience.
This option avoids unnecessary conjunctions while maintaining parallel structure, making it a more concise choice.