1.What is it that we neber borrow but often return

1.What is it that we neber borrow but often return

题目
1.What is it that we neber borrow but often return
2.What is it that can carry a message to anybody in any town.
3.It takes three generations to make a gentleman .
4.There is no royal to learning .
5.Seek the turth form facts .
不好意思……分不多了……
答案
Are they all the riddles?
1. Thanks!
2. Mailers, or couriers.
3. Knowledge?
I don't understand the last two.
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