Uzupełnij luki w zdaniach wyrazami z ramki. Podano dwa wyrazy dodatkowo.
about, away, for, in, of, on, to, up

Przykład: We’re looking _for_ new houses for stray cats.
1 We must care _____ the environment.
2 Pollution is present _____ the air we breathe.
3 What does the air consist _____?
4 When walking your dog, keep it ____ a leash.
5 You should always pick ____ litter after yourself.