（）twice, the postman refused to deliver our letters unless we chained our dog.

单项选择题The biggest whale is（）blue whale, which grows to be about 29 meters long—the height of（）9-storey building.

A.the；the
B.a；a
C.a；the
D.the；a

单项选择题John was given the same suitcase his father and grandfather（）with them to school.

A. took
B. had taken
C. were taking
D. would take