Question：What did Sarah buy?

Sarah: Anybody here? 
Shop-keeper: Coming, I’m coming… Hi, Sarah. What do you want today? 
Sarah: Quite a lot. I need one pound of potatoes, three pints of milk, and a dozen brown eggs, two pounds of corn, one pint of olive oil, one pound of cucumber, half a pound of mushroom, and one pound of tomatoes. 
Shop-keeper: Do you need any fruit? Our fruit is very fresh today. 
Sarah: How do you sell the lemons?  
Shop- keeper: Lemons are three for ten cents.  
Sarah: Are they juicy? I want to use them for juice.  
Shop-keeper: They are ripe and juicy, so are the watermelons.  
Sarah: No, I don't want watermelons. They're not in season yet. Just give me a dozen lemons.  
Shop- keeper: Very well. Anything else?  
Sarah: I also need a loaf of sliced bread and a pound of coffee.  
Shop- keeper: What kind of coffee? Drip or instant?  
Sarah: Give me the instant.  
Shop- keeper: All right.  
Sarah: And a bottle of catsup. Any brand will do....Can you send this order to my house this afternoon?  
Shop- keeper: Certainly! 
Sarah: Thanks. How much are these? I'll give you a cheque now.