Jenny’s uncle is a scientist. She is proud ________ him.
In our city, _____ middle school students want to be a teacher in the future(将来) every year.
My brother is _____ his homework. He often _____ his homework at home.
—Here is a schoolbag. Whose is it? —Oh, it’s _______ Thank you.
—_______ is this pen? —It’s mine.
This is ______ key and that is ______ eraser.