The oldest building in the city is 500 years old

28. The oldest building in the city is 500 years old.
A. The city was built 500 years ago
B. 500-year-old city has the oldest building
C. The city has a 500-years-old building
D. The oldest building of the city is 500-year-old one.
29. He answers all questions about President Ho Chi Minh. No one can do that.
A. He is the only person to answer all questions about President Ho Chi Minh.
B. He is the only person answered all questions about President Ho Chi Minh.
C. He was the only person to answer all questions about President Ho Chi Minh.
D. He is the only person answering all questions about President Ho Chi Minh
30. He always arrives at the office early. He is always the first one there.
A. He always arrives at the office early is always the first one there.
B. He is always the first one to arrive the office early.
C. He is always the first one arrive the office early.
D. He is always the first one to be arrive the office early