Question

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Answer 1

EX11
1, boy's car
2, It's Khanh's English books
3, the cover of the magazine/ the magazine's cover
4, my friends' house
5, the cup's coffee
EX10
Peter's 
Smiths'
children's
Nam's
Susan
Steve's
Men's
parents'
Charles's
boy's
boys'

Ex3
b - b - b - d - a - b - c - a - d - c