4. Choose the correct answer:
a. Tom’s car is as big as / the biggest his friend’s.
b. Who is shorter than / the shortest person in your family?
c. Who is more independent than / the most independent person you know?
d. These sofas are more comfortable than / the most comfortable ours.
e. My brother is taller than / the tallest in the class.
f. Is Jason’s dog older than / the oldest yours?
g. Who is the best / better than singer in the world?