完形填空：

　　The story happened in Paris in 1860. One evening Mathilde's husband, Pierre Loisel, came home from work with great 1 , because he not only had been invited to the palace ball 2 was the only person in his office that was invited. He told his wife the wonderful news. Mathilde was so 3 that she couldn't believe what she 4 . When she 5 it was true, she thought she couldn't go because she didn't have an evening dress 6 jewellery for the ball. She was afraid 7 . At last Pierre decided to 8 all the money, they had to buy a dress for her and 9 her to borrow jewellery from Jeanne, her friend, who married a man with a lot of money.

　　The next day Mathilde 10 her friend, Jeanne, and asked if she could lend her some jewellery to her. Jeanne brought out all her jewellery and let Mathilde 11 the one she liked best. Mathilde noticed a lovely diamond necklace 12 a big blue stone in the center, 13 and it was very 14 .

　　 15 the evening when the ball was held, Mathilde was wearing the dress 16 she spent 400 francs and the necklace 17 from her friend and went to the ball with Pierre. They had a very good time at the party.

　　But it was on that night 18 she found the necklace was missing on their way home. They

19 back to the palace and looked for it 20 . Unfortunately, they couldn't find it. “What's to be done? ”Both of them were in deep thought.

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