选句子，补全对话。
| A． What can I do for you? |
| B． They are nine yuan. |
| C． That’s twenty-nine yuan. |
| D． It’s twenty yuan. |
E. Here is your change.
Assistant: Hello. 1._____
Tom: Hi. How much is a doll?
Assistant: 2. _____
Tom: How much are the balloons?
Assistant: 3._____
Tom: I’d like to have a doll and these balloons.
Assistant: 4._____
Tom: Here is thirty yuan.
Assistant: Thank you. 5._____
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