I somewhat cheated because I already know what exploit means and it frequents my every day vocabulary.
However you can tell through context clues the answer is to use someone unfairly because the word is referring to how children are being taken advantage of by using them to work for little pay.
If a dependent marker word is used, the clause cannot stand alone as a complete sentence. For example: "If she leaves" = not a complete sentence. If an independent marker word is used, the clause can stand alone as a complete sentence. For example: "Therefore, she leaves" = a complete sentence.
The way in which the public can be involved in nation building through sport is when they solely support the representative of their country. However, this will impede if they don’t support their own representative instead, they support others. They will not wear their country’s honor with pride.