Only the first one, 'That is worth reading' is correct. 'Worth' is an adjective, and it is followed by the gerund (ing form).
Don't believe anyone who tells you that you can say 'worth to' with the infinitive - this is wrong.
27 juin 2016
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That is worth reading
27 juin 2016
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That is worth reading
27 juin 2016
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You should use "reading"
28 juin 2016
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It/ That is worthy to read.
27 juin 2016
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