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Sally was a student．It was going to be her mother's birthday．She wanted to buy her a present that would be nice and useful but not expensive．
She went shopping after a quick and simple lunch．After she looked for half an hour, she found a shop that was selling cheap umbrellas, and she decided to take a black one．
She thought,“Mom can carry it when she is wearing clothes of any color．”So she bought a lovely black umbrella and took it to school with her until her class finished．
On her way home on the train she felt hungry because she had so little for lunch．So she went to the buffet car(餐车)．She left the umbrella on her seat．But when she got back, it had gone!
Sally began to cry．The other passengers felt very sorry for her and asked what the matter was．She told them the black umbrella she bought for her mother had gone, and she had to get off at the next station．After the three passengers heard this, they asked her for her mother's address so that they could send the umbrella to her if someone took it by mistake and brought it back．
And now a week passed．Sally got a letter from her mother．It said“Thank you very much for your lovely gifts, but why do you send me three black umbrellas?”
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