This pen is for Mary. Give it to ______

18. This pen is for Mary. Give it to ______.
A.           she
B.           her
C.           hers
19. You can't have any chocolate! It's ________!
A.           your
B.           its
C.           her
D.           mine
20. John can't do his homework. Can you help ______ ?
A.           he
B.           his
C.           him
21. ________ pencil is broken. Can I borrow ________?
A.           Mine, yours
B.           Your, mine
C.           My, yours
D.           Yours, mine