is one of 
basicCorrect article usage
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  needFix the agreement mistake
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  forChange preposition
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  almost all 
humanFix the agreement mistake
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  in the world. there are many various sports 
activityFix the agreement mistake
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  in each country. 
athleteFix the agreement mistake
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  consider 
 as their career meanwhile others do 
 only for their health. in 
 , the writer will give 
Correct article usage
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  aboutChange preposition
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  thisCorrect determiner usage
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  two points of view.
sports have become one of the most promising 
jobChange to a plural noun
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  in the world. it 
haveChange the verb form
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  been started since long time ago. many people have decided to become an 
 since they were 
a Correct the article-noun agreement
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 kids. 
 a football player named 
messiChange the capitalization
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 , 
he Correct pronoun usage
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 has played since a really young age and now he is one of the best 
athleteChange to a plural noun
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  inChange preposition
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   era. there are lot 
thingsChange preposition
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  to consider before people state to become an 
  as training almost 
everydayCorrect your spelling
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 , injury, a shorter career and many more. 
, athletes have a bigger chance to get injured either 
is Unnecessary verb
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 common or 
badChange the word
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  injured. most of them 
 retired when 
theirChange the pronoun
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  reached their 30s or 40s. 
 with people who only work out to stay fit. they spent maybe two or three times a week 
to doChange the verb form
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  exercise. they mostly spent work on other staff. 
, some of these workers do 
 as their hobby. they play football, basketball, cycling,etc only for fun or just to 
spentWrong verb form
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  timesFix the agreement mistake
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  with 
colleagueFix the agreement mistake
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 .
, 
considerWrong verb form
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   as a career and 
doWrong verb form
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   to stay fit are two different things. 
by Change preposition
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 deciding to do 
 for life means you have to be more serious 
onChange preposition
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  it 
unlikeAdd the comma(s)
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  others who do it only for their health or fun. there 
isChange the verb form
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   some considerations that you need to think 
beforeChange preposition
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  you decide.