How to use "preserve" in a sentence

YOU have no oath registered in heaven to destroy the government, while I shall have the most solemn one to "preserve, protect, and defend it."

If she was ever to stop dreaming about the boy, if she were to get control of her grief, she must begin her recovery here, in this room, by conquering her irrational need to preserve his possessions in situ.

'If you want to preserve your incognito,' said Holmes smiling, 'then you should not write your name on the inside of your hat, or else you should turn the inside of your hat away from the person whom you are addressing.'