Review: Units 5-8
1-5 CABDA 6-10 CCDBA 11-15 BACBD 16-20 ACBCD
21-25 ABCDD 26-30 CBADC
31. possible 32. linking 33. around the world 34. sharing
35. electronic library 36. receive 37. find out
38. when it all began
39. making their computers survive an attack
40. how they ever got by without the Internet
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