Fill in the Blanks Unit 7Online version Unit 7 by Ms Casanova 1 A long time ago it was difficult to move things , the solution for this was this invention of the . 2 is not an invention , we can see it in nature , like in lightning . But inventors used their imagination and to find new ways to use it . 3 It's difficult to imagine ourselves living without things that have , they don't need to be plugged in to work . 4 Some ideas don't succeed at first , but it's important to keep trying after you .
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