Which of the following words best describes mum？
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听下面一段材料，回答 17～20 题。
第 17 题 What happened to the shop in one month？
The writer doesn’t believe that＿＿＿．
There is a bad smell here．
0h，dear!I＿＿＿the gas．
Would you like a cup of coffee first，＿＿＿shall we get down to business fight now？
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