But instead of the energy being concentrated in one place,the holes provide many weak spots that all absorb energy as they break,says Vincent.You are controlling the places_________ the wood breaks,and it can then absorb more _________ ,more safely.The researchers believe the principle could be applied to any material- _________ example.to manufacture lighter and more protective packaging.It could _________ be used in Car bumpers,crash barriers and armour for military vehicles,says Ulrike Wegst, _________ the Max Plank Institute for Mental Research in Stuttgart.But she emphasizes that you _________ to design the substance with the direction of force in mind.The direction of loading is crucial,she says.
51 A in B since C for D at
52 A or B although C and D despite
53 A down B over C up D into
54 A knew B concluded C saw D thought
55 A no B per C each D every
56 A it B the idea C they D spruce
57 A if B Just C Only D Rarely
58 A effected B beaten C slapped D affected
59 A behind B beyond C for D in
60 A which B there C that D where
61 A water B air C energy D safety
62 A among B in C as D for
63 A also B besides C else D yet
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