选词填空。

What colour,  What time,

What,  Where,  Who

1. —            is the canteen?

    — It's on the first floor.

2. —            Is your T-shirt?

    — It's yellow.

3. —            is that boy?

    — He is my brother.

4. —            is it?

    — It's 7 :00.

5. —            is that?

    — It's a dog.