1 A: Should they keep the planet clean?B: Yes, they should
2 A: Do they kill the animals?B: Yes, they do.
3 A: Do they litter the planet?B: Yes, they do.
4 A: Should they grow trees and flowers?B: Yes, they should.
5 A: Did they cut down the trees?B: Yes, they did.
6 A: Did they light fires in the forest? B: Yes, they did.
7 A: Should they keep rivers and lakes clean?B: Yes, they should.
8 A: Should they make the planet a better place? B: Yes, they should.