Insert the indefinite, definite or zero article depending on whether the

Insert the indefinite, definite or zero article depending on whether the meaning is general or particular. The trick is to drop (1)... playing card into (2)... hat resting at your feet. If (3)... card is held vertically when released, it flutters wildly and completely misses (4)... target. Held horizontally, it settles gently, with little wayward motion, directly into (5)... hat. This phenomenon, sometimes displayed with (6)... coins dropped in (7)... liquids instead of (8)... cards in (9)... air, is not only (10)... subject of (11) ... amusement and bets, but also (12)... topic of considerable interest to (13)... researchers studying (14)... chaotic dynamics. It has applications in chemical engineering, meteorology, sedimentology and other fields.