Zaznacz poprawne opcje.

1 People burn a lot of fossil energy / fuels.
2 Storm / Stormy weather can be dangerous in the mountains.
3 Thunder / Lightning hit a tree and set it on fire.
4 Dolphins and sharks / whales aren’t actually fish. They breathe in air like humans.
5 There was terrible fog / foggy and we couldn’t see the path in the forest.
6 Some factories pour their toxic pollution / waste into rivers and lakes.