Who is , Mr Green or Mr Smith?
A. very rich
B. much richer
C. the richest
Do you think which classroom is in our school?
A. clean
B. the cleaner
C. the cleanest
Mr Zhang is one of in No. 1 Middle School.
A. the busiest teacher
B. the busiest teachers
C. the busy teachers
Of all the boxes, the red one is .
A. heavy
B. heavier
C. the heaviest