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5 I have read book twice because it is very interesting 
-> this book
6 minh won' t pass the final exam if he doesn't learn hardeer 
-> unless ........
7 scientists have reported that there is far too much pollution nowadays in city areas 
-> it ...........
8 my sister likes reading books better than watching IV in her free time 
-> my sister ............
9 my mother sometimes wants to come back to her childhood 
-> my mother sometimes wishes she ...............