who or which

I have some friends ________ are shopaholics.

My mom gave me a piggy bank ________ is not pink.

I love to go to shops ________ give big discounts.

Gisela is a person ________ can’t resist sale at malls.

Do you know the author ________ wrote that book for teens about saving money?

Do you have a friend _______ can't say ‘no’ to people who try to sell him/her stuff?

My mom uses her credit card to buy clothes ________ make her look really good.

It’s a shop ________ sells things at big discounts.