题目：
| 阅读下面的对话，指出能填入相应空白处的最佳答案。 | ||||
| A：What's the 1 today, Mary? B：It's May 21st. A：Oh, tomorrow is your mom's birthday. Do you 2 ? B：Of course, I do. How shall we celebrate it? A：First of all, a birthday present. What about 3 her a beautiful sweater? B：That's a good idea. I think it will make 4 happy. A：Er… shall we have a special dinner? B：Yes, Dad. How about a Chinese dinner? A：OK, I'm going to buy a sweater. You can cook at home. B：Oh, don't forget to buy a 5 . A：Certainly. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
解：123-4-5-6-7+8-9=100或123+4-5+67-89=100等（答案不唯一）
