Some people also consider super glue a household necessity. this solid gum didn't spring to life from someone's 12 though. rather, its inventor 13 across it twice before realizing its potential. first, while looking to 14 plastic for guns during world war ii, harry coover noticed that the substances he worked with - called cyanoacrylates - were 15 sticky. it wasn't until he began working with them again in 16 to develop heat-resistant materials that he came back to these compounds, which hold a superior bond with no heat.

12) 1 imagination. 2 creativity. 3 vision. 4 inspiration.

13) 1 met. 2 occured. 3 went. 4 came.

14) 1 build. 2 create. 3 make. 4 form.

15) 1 chiefly. 2 mostly. 3 mainly. 4 particularly.

16) 1 efforts. 2 tries. 3 case. 4 forces.

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