Interchange 1 test units 1 to 8

Interchange 1 test units 1 to 8
Interchange 1 test units 1 to 8
Interchange 1 test units 1 to 8
Interchange 1 test units 1 to 8
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Author's Instructions

Test for book Interchange level 1 - from units 1-8 just as the book suggestes.