Answer:
Everyone, nobody.
Explanation:
Indefinite pronouns are those pronouns used in places of names or a specific person or thing. They do not specify what the pronoun is, nor do they provide any indication of what the pronoun represents. They replace the nouns but do not provide any indication of what nouns they stand for.
In the given sentence, we can use the indefinite pronoun "<em>everyone</em>" and "<em>nobody</em>" as the sentence is in the contrasting side of each other. So, the new sentence will be-
Suzy loves to bake cookies for her family. <em><u>Everyone </u></em>loves them, but <em><u>nobody </u></em>helps her clean up.
This shows that while all the members of the family loves her cookies, only few of them help her clean up. Also, the indefinite pronouns are in the singular form as the corresponding verb is in the present tense.
If it was mandatory they would be given a perfect opportunity for those who love to participate in activities like students who don't know where to start, and those who would like to try with there friends
