Task 1: Which of the following volunteer activities do you think is the most beneficial to the environment, cleaning the city, planting trees or recycling?

　　Sample

　　I think planting trees is the best thing to do. First, trees and plants are the reason why we have oxygen to breathe in the first place. For example, when traveling to a rural area, we can notice how the air is much cleaner outside of the city. This is because there is more vegetation to provide us with clean, life-giving air. Second, not only humans need trees to survive, animals do too.