Where can you finish a book without finishing a sentence?

A barrel of water weighs one hundred pounds someone puts something in the barrel and now it weighs sixty pounds. What did they put in the barrel.

I am shaped by the days that are to come, but I do not forget about the days that were. People often need to remember events and such: that job is for me.

I fade even though I'm cherished Sometimes I am all that is left But in modern times I am trapped. In card, in disks, in solid states.

I can leave a mark, but I cannot cover up. People use me to Select importance.