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__________(1)wrote,“Friendships are,from year to year,the best of all life's treasures.”But__________(2)a good friend to someone is never simple or easy.It__________(3)wisdom and lots of hard work.Demanding that a friend give his full attention__________(4)you can destroy a relationship.Let your friend decide for himself __________(5)to spend time with.

4. ()

A.of
B.upon
C.on
D.to

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