Choose the correct words.

1 If / Unless it rains, we’ll go to the beach.
2 If / Unless you don’t study, you won’t be able to go to university.
3 If / Unless he asks her, he’ll never know.
4 A lot of people will be affected if / unless we all work together to save the rainforests.
5 My brother will get ill if / unless he doesn’t start looking after himself.