The boy is ---.Let's take the --boy to hospital.

C
ill 和sick都有"生病的；有病的"之意,但用法并不完全相同.
　　ill 表示"生病的；有病的"这一意思时,一般用作表语,不能作定语；而sick 既可以作表语又可以作定语,如"病人"可以说a sick man 或the sick,但不能说an ill man 或the ill.又如：She is ill / sick in bed.她卧病在床.She is looking after her sick father .她在照顾她生病的父亲.