1. A. Have you ever visited Ha Long Bay?
B: No, I haven't.
2. A: What were you doing while the teacher was explaining the project?
B: I was going out.
3. A: Did you met a famous person when you were working in the coffee shop?
B: No, I didn't.
4. A: What happened when you were cooking?
B: A thief got into our house when I was cooking in the kitchen.
5. A: What did you see when you were going fishing?
B: I saw an accident when I was going fishing.
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