Pogodbene rečenice i wishes (Conditionals and Wishes)

Read the text below. For each question (25-32), choose the answer (A, B, C or D) that best completes the sentence. There is an example at the beginning (0 → A).

Zipper

Have you ever thought what life might be like without the humble zipper? In a stiff breeze, it's handy to have a jacket that zips (0) ____. Blue jeans probably wouldn't be fun to wear without zippers either!

If you go on a camping trip, your suitcase or backpack might spill its contents everywhere (25) ____ it is zipped shut. You might also get cold at night if your sleeping bag doesn't zip up.

The inventor of the sewing machine, Elias Howe, received a patent in 1851 for an 'Automatic, Continuous Clothing Closure' but didn't market it, because he was too busy (26) ____ the sewing machine.

Over 40 years later, Whitcomb Judson improved upon Howe's idea and designed a fastener for shoes. The product was launched at the World's Fair in Chicago, but it (27) ____ much success.

The modern zipper was eventually designed in 1913 by Gideon Sundback. His design increased the number of fastening elements (28) ____ 10 per inch and included two rows of interlocking teeth and a slider. It was the first fastener to resemble a zipper. But Sundback didn't come up (29) ____ the name! The name "zipper" was developed by the company that used this device on the rubber boots they produced.

Early on, zippers were mainly used on boots and it (30) ____ another 20 years before the fashion industry began to use zippers on clothing. One of the first uses was replacing the buttons on men's trousers with zippers.

It was a long way up for this mechanical wonder that has kept our lives "together" (31) ____ many ways. The zipper was invented by several dedicated inventors, though (32) ____ convinced the general public to accept it in everyday life. It was the fashion industry that made the novel zipper the popular item it is today.

...your suitcase or backpack might spill its contents everywhere (25) ____ it is zipped shut.