The story of man’s mastery of the air is almost as old as man himself, a puzzle in which the essential clues were not found until a very late stage. However, to (1)________ this we must first go back to the time when primitive man (2)___________ his food, and only birds and insects flew. We cannot know with any certainly when man first deliberately shaped weapons for throwing, but that (3)_______ of conscious design marked the first step on a road that (4)________ from the spear and the arrow to the airplane and the giant rocket of the present (5)______. It would seem, in fact, that this (6)_________ to throw things is one of the most primitive and deep-seated of our instincts, (7)__________ in childhood and persisting into old age. The more mature ambition to throw things swiftly and accurately, which is the origin of most (8)_____ games, probably has its roots in the ages when the possession of a (9) ________ the difference between eating and starving. It is significant that such weapons were (10)_______ and brought to their (11)____ form at an early stage in history. If we were restricted to the same (12)__________ , it is doubtful if we could produce better bows and arrows than those that (13)_________ the armies of the past. The arrow was the first true weapon capable of maintaining direction over considerable (14)______________. It was to be centuries before man himself could fly.

The story of man’s mastery of the air is almost as old as man himself, a puzzle in which the essential clues were not found until a very late stage. However, to (1)________ this we must first go back to the time when primitive man (2)___________ his food, and only birds and insects flew. We cannot know with any certainly when man first deliberately shaped weapons for throwing, but that (3)_______ of conscious design marked the first step on a road that (4)________ from the spear and the arrow to the airplane and the giant rocket of the present (5)______. It would seem, in fact, that this (6)_________ to throw things is one of the most primitive and deep-seated of our instincts, (7)__________ in childhood and persisting into old age. The more mature ambition to throw things swiftly and accurately, which is the origin of most (8)_____ games, probably has its roots in the ages when the possession of a (9) ________ the difference between eating and starving. It is significant that such weapons were (10)_______ and brought to their (11)____ form at an early stage in history. If we were restricted to the same (12)__________ , it is doubtful if we could produce better bows and arrows than those that (13)_________ the armies of the past. The arrow was the first true weapon capable of maintaining direction over considerable (14)______________. It was to be centuries before man himself could fly.