The document is a telephone conversation.
Jack has gone* to Australia for 6 months to study. He is calling his mum in Bristol (in Britain). He is telling her about his experiences and opinion.

* He has been* to Sydney and he has visited the opera house. He thinks it is fantastic. For him, Sydney is the coolest city he has ever visited.

* He has travelled a long trip to the outback. Uluru is the most beautiful site he has ever seen*. He thinks it's gigantic. He has spent* a great time.

* He has met* aboriginal artists. He is enthusiastic about their art. It's the most unusual way of painting he has ever experienced.

The document is a presentation of Australia in history and geography class.

- Important cities: Canberra is the capital city but Sydney is the largest city. The biggest cities / The most populated cities are in the South and in the East.

- Geography: Australia is in the Southern hemisphere. It's the smallest continent in the world / on earth.

I've been* in a safari three times.
I've taken* a lot of photos of the wild.
I've already crossed the outback.
I've done* kayak.
I've scuba-dived in the Great Barrier Reef.
I've climbed Ayers Rock.
I've mountain-biked in the Himalayas.

-> I'd like to discover the world!

He has already crossed deserts.
He's already bungee-jumped.
He's already scuba-dived.
He's already climbed mountains.
He's already mountain-biked.
He's already run* marathons.
He's already written* a lot of articles and a website.
He's already met* a lot of different people.
He's already given* a lot of radio interviews.

-> the document is a CV / resume of Ben. Maybe he wants to be an explorer.

Ben is energetic.
He speaks too fast. He loves sport and adventures = he is sporty and adventurous.
He's not scared of danger = he's not easily-scared.
He is a dare-devil.