Gum is one of those things we tend to take for granted, and we (A1) ... it, in various forms, since ancient times., were chewed, are chewing, will be chewed, have been chewing, had chewed, Today, gum (A2) ... in a variety of shapes, sizes and flavours. Have you ever tried to blow the ultimate bubble with your gum? It isn’t always easy. But it is always fun!, was coming, will come, has been coming, came, comes, February 5th is Bubble Gum Day. The first successful bubble gum (A3) ... in 1928 by a man named Walter Diemer., had invented, invented, was inventing, has invented, was invented, He worked at a chewing gum factory (as an accountant!) and (A4) ... with all kinds of gum recipes., was experimented, was experimenting, had experimented, has been experimenting, will experiment, One day, Walter came up with a formula that wasn’t as sticky as regular gum. It was also super stretchy. This (A5) ... you could blow bubbles with it., meant, was meaning, has meant, would mean, was meant, This was revolutionary — many people before (A6) ... to make bubble gum, but they were mostly unsuccessful., were tried, were trying, have been trying, had tried, have tried.

ЦТ 2021 Вариант 10

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