Choose the best answer

6... brother is tall.
A.            his
B.            him
C.            he
7. I waited for ... yesterday but you didn't come.
A.           your
B.           you
C.           yours
8. These are ... pencils.
A.           ours
B.           we
C.           us
D.           our
9. This letter is for ...
A.           she
B.           hers
C.           her
10... didn't do the homework.
A.           Yours
B.           You
C.           Your