1. Helen and Mary are good friends, so _______ often help each other.
A. them B. theirs C. they D. their
2. Jack, I’m talking to you. Please listen to _______ carefully.
A. I B. me C. my D. mine
3. —Who teaches _______ painting?
—Nobody, I teach _______.
A. your；mine B. your；my
C. you；myself D. you；me
