Complete the sentences with a, an, the or –.

Example: Like most boys, I wanted to be __a__ firefighter when I was a child.

1 I'm going to ask you just one question. If you manage to answer _____question correctly, you'll pass the exam.
2 Is it true that people in _____Middle Ages didn't take baths and that it led to the spread of many diseases?
3 The first European expedition reached _____Australia in 1606.
4 I'd like to know if the African elephant is _____endangered species.
5 Many people complain that _____public transport is getting more and more expensive every year.