题目：
单句改错。
1. Restaurant owners should know how to make customers to spend more money.
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2. People only sit for about 20 minutes after they leave.
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3. For times an ad can lead you to buy something you don't need at all.
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4. Sometimes we can be cheated by the ads for they are very confused.
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5. His rudeness made me very annoying.
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答案：
1. to不要
2. after 改为before
3. For 改为At
4. confused 改为confusing
5. annoying 改为annoyed
