Alcohol can greatly damage our health if we dont pay special

【答案】Alcohol can 【do】【great】【harm】【to】 our health if we dont pay special attention to it.
或者
Alcohol can 【cause】【great】【damage】【to】 our health if we dont pay special attention to it.
两种填法都对
【注】
do harm to = be harmful to = cause damage to = damage
意思：对……有害；损害……