"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 september 2014
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Only 'hard' is right.
1 september 2014
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!