#1 is fine. #2 sounds odd. Refuse would work better there.
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contiluo2. Sam wanted to reject him because he considered that it was dangerous to ride a motorbike.I don't really understand the meaning with either 'reject' or 'refuse'. Could you explain your sentence more?
contiluo Sam wanted to refuse him because he considered that it was dangerous to ride a motorcycle.I see. Then 'reject' does not work at all, and it would be clearer if he 'refused the ride' not the person himself.