Choose the correct options to complete the textHave you ever visited
visit
visiting
visit
the North Pole? It's the motherland for polar bears, arctic foxes, rare birds such as black-legged kittiwake, northern fulmar and snow bunting. Most people are scared of going hiking in freezing temperatures. Sam have wanted
has wanted
wanted
wanting
to go on a north expedition since his birth. He's even created a Facebook page about global warming and severe climate changes. It's very important to tell teenagers about it.
He didn't finish
hadn't finish
hasn't finished
finishing
school yet but he has already achieved great things.
In 2009, he established
has established
have established
establish
a charity organisation to save polar bears. He was only fifteen years old when he gathered
has gathered
have gathered
gathering
more than $50,000 to save bears. This year he is planning to go to the North Pole with tons of fish and special equipment.