Which is the correct way to complete the paragraph below?   ...

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Which is the correct way to complete the paragraph below?
                                                How to Become a Pro Gamer
Easy to understand, that is. ________ for a living isn't all fun and games. It takes time, skill and determination ________ in today's competitive circuits. If you're up for the challenge, here's what you need to do.
(Adapted frora http://iq.intel.com/want-pro-gamer/?sr_source=lift„gravity&v=3)
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