一、听一听，标序号。

1. B: Why are you laughing?

   G: Because I’m happy. I’ve got a present.

2. G: Why are they eating so fast?

   B: Because they’re very hungry.

3. B: Why is he tired?

   G: Because he’s playing football.

4. G: Why is she crying?

   B: Because she’s sad. She couldn’t find her schoolbag.

5. B: Why are you wearing a raincoat?

   G: Because it’s going to rain.

6. G: Why were you late for school this morning?

   B: Because I was ill.