Choose the correct answer

11. London's Heathrow Airport is
airports in the world.
A. the one busiest of
B. one of the busiest
C. the busiest one of
D. of the busiest one
12.
the warning, they failed to evacuate the area.
A. Despite of
C. Even so
B. Although
13. After he won the award, Mr. Galves was grinning from
A. eye to eye
B. mouth to mouth
14. The Ruhr Valley in Germany is
A. a heavy industrial
B. a heavily industrialized
area.
D. In spite of
C. head to toe
D. ear to ear
C. an industrially heavy
D. a heavily industry