A—ambulance
B—credit card
C—website
D—catalogue
E—on vacation
F—metro
G—download
H—be clearly marked and priced
I—network games
J—traffic jams
K—magazine cover
L—house to let
M—IT
N—campus life
O—sale discount
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A. To the man’s office. B. To the manager’s house.
C. Home. D. To the manager’s office.

A. have been known to scientists for years
B. have only recently been discovered
C. are known by everyone
D. will probably remain a mystery