Fill in the Blanks Team Together 4 Unit 2Online version Lesson 7 by Yuliia Smoliana 1 visited found information Hello , everyone ! Today , I a museum and out a lot of amazing about cardboar d 2 quickly cereal cardboard started could picture In 1879 , a Scottish engineer called Robert Gair invented the box . He could make a lot of cardboard boxes very , and so for the fi rst time , food companies use cardboard to hold food . In 1906 , the Kellogg company using very thin cardboard boxes for its . This was the first time that a box had the name and of the food on the outside ! 3 cardboard use strong Today , we cardboard boxes for many different things because is so . 4 triangles know shape carry Do you why cardboard is so strong ? Inside each piece of cardboard , there are a lot of . Triangles are really strong : they can a lot . Do you sometimes make a house of cards ? If you use triangles , it works . If you try it with square shapes , it doesn ? t work . Try it and see ! The triangle is the stronges t 5 triangles bridges learned I that there are triangle shapes everywhere : in , in houses , on bikes and even on kites ! Look at these pictures . Can you find the ?
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