Most people 1...(never visit) the North Pole, but Parker Wilson has. Last year, Parker 2…(ski) 130 km across the Arctic in freezing temperatures. In the same year, he also 3…(start) a Facebook page about climate change. It's amazing because Parker is only sixteen years old and still 4…(not finish) school-he's a very young adventurer.
5….you …(ever be) to the South Pole? Maybe not, but in 2009, Walter 6...(walk) there and back in twenty days. She was only seventeen years old and she 7…(make) a lot of money for charity.
Parker and Katie 8…(achieve) great things, but they are both still teenagers. 9…they ….(do) too much, too young? Some people think so. Some psychologists say that it's dangerous for teens to take these risks because their brains 10…(not develop) enough. Katie and Parker probably disagree. What do you think?