Indefinite pronouns

"There isn't ________ in the room right now." (Options: anything, nothing, everything)

"Nobody ..............(wants/want) to eat the last slice of pizza."

Which word is an indefinite pronoun in this sentence? "Everyone is excited about the school trip."

What is the symptom of 'stomach ache' ?

I've got a ............ I am shivering.

No one ............... (knows/know) about this.

Has anyone seen khalid? ..............(No one/Nothing) has seen him.

Someone ..................(is/are) here

I have got a ................... I can't talk because I lost my voice. (what is the illness?)

"________ wants to go to the park after school." (Options: Someone, Something, Anybody)

I saw someone yesterday. (Which one is the indefinite pronoun?)

is everyone here? (Which one is 'indefinite pronoun'?)