Jack: It’s hard to see how they can be stopped [1]. In the UK we get rid of three million a year altogether!
Annie: That sounds a lot, especially because [2] hardly ever break down.
Jack: That’s right. In this country we keep domestic fridges for 11 years on average, and a lot last for 20 or more. So if you [3] the cost by the number of years you can use a fridge, they’re not expensive, compared with some  [4].