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advice them not to throw
tell them about consequence of environment
tell them about conservation of paper and how valuable is paper to our lives
make them aware of poor and needy people who does not get any facilities
make them aware about advantages of old note book how can they be used for rough purpose in studies etc
make them aware of value of money and not to waste money 
they can sell the nb on low coast shops
they can tear all the unused pages and bind them and use for your purpose or use them for donating charity or sell them
donate the books to charity or poor or needy people
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nice answer
mark as brilliant ans