In 
 century, the 
humanFix the agreement mistake
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 themselves by 
going toVerb problem
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timeChange preposition
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. In my opinion, it 
is meansChange the verb form
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of Change preposition
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countryAdd an article
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First of all, the choices of alternative 
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lastCorrect article usage
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  century. It can look 
howChange preposition
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   treat themselves for 
cureFix the agreement mistake
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  fromChange preposition
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  illnesses using 
. It 
becauseAdd a missing verb
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  of Change preposition
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 there was 
littleAdd an article
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  amount of 
 and available 
 in their place. Now, the number of 
doctorFix the agreement mistake
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  and health 
facilityFix the agreement mistake
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  like 
hospitalFix the agreement mistake
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  or 
clinicFix the agreement mistake
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  spreading in 
villageFix the agreement mistake
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  and big 
cityFix the agreement mistake
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 . The 
 haveChange the verb form
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  many kinds for different kinds of 
. That can be 
choiceCorrect article usage
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  by the 
. 
, nowadays there are 
kindFix the agreement mistake
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 specialistFix the agreement mistake
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  that can 
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 illnessFix the agreement mistake
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  by their specialist of ill. 
the 
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takeChange the verb form
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  a longer 
. The reason is, 
herbsCorrect word choice
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slowAdd an article
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  . It means, 
somebodyCorrect word choice
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  who need more care by their sick need more 
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bodyAdd an article
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  and 
became more sickReplace the word
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, the development of 
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  more patent and can cut 
ofReplace the word
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quicklyCorrect quantifier usage
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herbsReplace the word
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  . 
On 
otherCorrect article usage
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  hand, 
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. They do not want the 
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giveVerb problem
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  side effects for a long 
. It makes 
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to Change preposition
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virusFix the agreement mistake
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  that spread by using 
. Because
,Remove the comma
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byChange preposition
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  using 
herbFix the agreement mistake
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In conclusion, 
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worstCorrect article usage
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  if 
 have heavy 
sickReplace the word
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ItCorrect pronoun usage
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  is because 
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  too qualified and take a 
longCorrect word choice
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   than chemical 
. The benefit of 
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  as much as chemical 
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givenAdd a missing verb
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  by the 
.