Replace the words in bold with an indefinite pronoun.
1 i think there's a person at the door.
2 where's jake? he's in a room in the school.
3 i've looked for my bag in all the places in the house. i can't find it in any place.
4 there's no food in the fridge.
5 ouch! i've got a small object in my shoe!
5 there's not one place we can by milk.