The can opener

It is difficult to imagine what life would be like today had the can opener not been invented. Without this simple little tool/instrument (1) that we take for gratitude/granted (2), how would we open cans? It is essential in providing us access to infinite/infinitive (3) advantages of canned goods including their variety/difference (4) and comfort/convenience (5) of usage.

Interestingly, metal cans to save/preserve (6) food had been existent/existence (7) for full fifty years before a device similar to the can opener we are famed/familiar (8) with was invented. Developed in England in1810, the first “tin canisters” were sometimes heavier than the food they content/contained (9). British soldiers in the War of 1812 opened canned ratios/rations (10) with bayonets, knives, or even rifles. On an Arctic expedition in 1824, British explorer Sir William Parry took along a can of veal, the instruction/introduction (11) to which read: “Cut round on the top with a chisel and hammer”.

Around the 1850s, Ezra J. Warner from Connecticut, derived/devised (12) a “can opener”. This opener was a composition/combination (13) of a bayonet and a sickle; if not used correctly, it could be lethal/fatal (14). Had the U.S. military not adopted this primitive can opener in the Civil War, the invention would soon have become instinct/extinct (15).

But, as the saying has it, necessity is the mother of invention. In 1870, William J. Lyman applied for a patent/pattern (16) for a device that was revolutionary in its concept/conception (17) and design. In 1931, the electric can opener was involved/introduced (18).

Now, that we are enjoying lightweight cans and easy-to-use can openers we should evaluate/appreciate (19) the efforts involved in the evolution of this important invention, which did not occur/happen (20) overnight.

12. Образуйте соответствующее однокоренное слово.

NYLON

It was only in the middle of the 20^th century that sufficient advances in chemistry became appreciate (1) to general public with the emerge (2) of synthetic materials on the market. Nylon was the first synthetic fiber to be commerce (3).

Nylon was invented by an American chemistry (4), Julian Hill in the early 1930s. Other scientists prove (5) his invention and finally on 27 October 1938, it was introduced to the world. Nylon is cheap and duration (6) and immediately became a successful, special (7) in making ladies’ stockings, and later tights.

During the Second World War, and in many not so prosperity (8) countries a long time after it, a pair of nylon stockings looked like an attract (9) and welcome gift to women. But what is more importance (10), nylon is used to make parachutes and tyres and many other practice (11) things. Today, nylon is found in many things: fabrics, clothing, carpets, seat belts, computers, and even art (12) parts for the human body. It has been playing an important role in our lives for over 60 years since its invent (13).

13. Выберите подходящее слово из предложенных двух вариантов.