"Pull it as hard as you can" is correct. It means to pull with all your strength.
"Pull it as strong as you can" is incorrect but native speakers will understand what you mean.
1 Eylül 2014
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Only 'hard' is right.
1 Eylül 2014
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!