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Parker Liautaud ........ (attempt) to reach the North Pole.
Parker Liautaud ATTEMPTED to reach the North Pole.
Two other teenagers ....... (reach) the North Pole previously.
Two other teenagers HAD REACHED the North Pole previously
They ..... (travel) with their parents but Parker ..... (go) with a guide called Doug who ..... (be) to the North Pole seven times before.
They HAD TRAVELLED with their parents but Parker WENT with a guide called Doug who HAD BEEN to the North Pole seven times before.
Unfortunately, the cracks in the ice .... (be) too large for them to cross.
Unfortunately, the cracks in the ice WERE too large for them to cross.
Doug ..... (not see) problems like that before on his other trips.
Doug HAD NOT SEEN problems like that before on his other trips.
In the end, they .... (fly) the last part of the journey in a helicopter.
In the end, they FLEW the last part of the journey in a helicopter.
