1.
a. It's his dictionary
b. It's your pencil
c. It's my chair
d. It's my automobile
e. It's my briefcase
f. It's your cat
2.
a. mine
b. yours
c. his
d. yours
e. mine
f. mine
g. his
h. his
i. yours
j. his
k. yours
l. mine
3.
a. in
b. isn't
c. is
d. isn't
e. isn't
f. is
4.
a. Where's
b. Here's
c. What's
d. That's
e. Where's
f. What's
g. Whose
h. Where's