One day, Piere, (whom)worked in a government office, received an (invite)to a palace ball. His wife, Mathilde, had no money (buy) jewellery, so she borrowed a (beauty)necklace(项链)from (she)friend, Jeanne. She looked very beautiful. And they had  wonderful time that evening.

    But after the ball, she (find)the necklace missing. They had to borrow a lot of money to buy a new one for Jeanne. In order to pay back the money, they worked day and night  10 years. Mathilde became very old, so Jeanne didn't recognize her when they met in a park 10 years (late).From this story, we know a person shouldn't be affected by vanity (虚荣心),  it will cost him a lot.