Lesson 67 A puncture

Tom: Pump up this tyre, Sandy. It's very flat.
Sue: What are you doing, Sandy?
Sandy: I'm pumping up this tyre.
Sandy: Whew! I'm tired.
Tom: It's still flat.
Tom: Let's take the tyre off the wheel.
Sue: Put the tube in this basin, Sandy.
Tom: Look at those bubbles. There's a puncture in this tube.