Here's the completed dialogue:
Boy: I'd like two tickets to York, please.
Woman: 'Here you are.
Boy: How much is it?
Woman: 2 It's ten pounds, please. (b)
Boy: What time does the train leave?
Woman: 3 At 10.30 a.m. (e)
Boy: What time does it arrive?
Woman: 4 At 10 a.m. (a)
Explanation:
The dialogue is about buying tickets for a train journey to York. Let's go through the logic:
1. The boy starts by asking for two tickets to York. The woman responds by giving him the tickets, which is 'Here you are.'
2. The boy then asks how much the tickets cost. The appropriate response from the woman would be to tell him the price, which is 'It's ten pounds, please.'
3. Next, the boy wants to know the departure time of the train. The woman answers with 'At 10.30 a.m.'
4. Finally, the boy asks about the arrival time. The woman responds with 'At 10 a.m.' This is bit nonsensical, it should probably arrive later than it departs. It might be the author's mistake.