Деревянко, 5. Учебник. Unit 12. Lesson 6

(1) keep
(2) clean
(3) litter
(4) fires
(5) cut down
(6) kill

(возможные варианты)
I think the planet is lifeless because they don’t keep the planet clean, they litter the planet. They don’t grow the flowers and the trees. They light fires. They don’t keep the water clean. They kill the animals.

Do you water the plants at school?
Do you keep your home town clean?
Do you help animals and birds?
Do you grow trees and flowers?
Do you make the planet the better place?

[ʌ] u (закрытый слог), o+m, o+n, o+th,
[e] e (закрытый слог), ea+d, ea+th,

(возможные варианты)
Grow trees and flowers!
Don’t light fires!
Don’t cut down the trees!
Keep the water clean!
Don’t kill the animals!