ie and ei words Crossword

Your sister or brother's daughter.
Do you want a ________ of cake?
The number after seven and before nine.
The person who lives next door.
Some moslem women wear this on their heads.
Some cars run on petrol and others run on __________.
A person who steals something.
A farmer grows their crops here.
The top part of a room. When you look up you see this.
The piece of paper you get when you buy something.
A school subject. It includes biology, chemistry and physics.
I think you are telling the truth. I _________ you.