19. －What's the matter with your brother ? －___________ has a cold.
A. She B. He C. His D. Her
20. He ran quickly all the way to school, ___________ he was still late.
A. but B. and C. or D. so
21. John starts work ___________ 10 o'clock every day.
A. in B. on C. at D. for
22. It is one of __________ buildings in our hometown.
A. tall B. taller C. tallest D. the tallest
