HELP PLEASEComplete the sentences with the present perfect or simple past forms of the verbs.
16. Parker’s first Antarctic expedition ........................ in 2009, *
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took place
has taken place
17. when he ............................. only fourteen. *
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was
has been
18. He first ............................. to trek to the North Pole at the age of fifteen. *
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tried
has tried
19. But since that expedition, he..................... the trek twice. *
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completed
has completed
20. In April 2010 he......................... the first person to check in at the North Pole via Foursquare. *
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became
has become
21. He........................... numerous talks on the issue, *
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gave
has given
22. and in August 2012 he.......................... at the prestigious TEDx conference in Belgium. *
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spoke
has spoken
23. He.................................. articles for The Huffington Post, The Independent and TheNew York Times. *
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wrote
has written
24. There is more ahead for this inspiring teenager and the world ................................. the last of Parker Liautaud yet. *
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hasn't heard
didn't hear