Read the passage and fill in the gaps with ONE word given in the box

I. Read the passage and fill in the gaps with ONE word given in the box. (1pt)

      serious            between               boys             is                   face                          

       Acne (11)…………… a skin condition. It causes small, red spots on the (12)…………………..and the back. It affects 70-80% of young people (13)………………12 and 30. More girls have acne than (14)……………. It’s not a (15)…………………... disease but young people want to avoid it.