Choose A, B or C and read the text below.
(1)... most striking feature of North America is
(2) ... vast chain of lakes which separates Canada
from (3) ... United States. Lake Superior, (4)...
greatest of these onland seas, is (5) ... largest
body of fresh water in (6) ... world. (7) ... other
principal lakes are Lakes Huron, Michigan, Erie
and Ontario, from (8) ... last of which issues
(9) ... noble river of St. Lawrence, which runs
(10) ... uninterrupted course of seven hundred
miles before it reaches (11) ... Atlantic. There is
thus (12) ... continuous current from (13) ... most
remote tributary of Lake Superior to (14) ...
Gulf of St. Lawrence, (15) ... distance of more
than two thousand miles.
