Clerk： Centrum？ We have bottles of thirty and one hundred tablets. Which kind do you want？

　　Patrick： Give me one bottle of one hundred tablets.

　　Clerk： And what kind of toothbrushes would you like？

　　Patrick： Can I have a look at them？

　　Clerk： Sure. This brand is supposed to be very good， but they're expensive. Those are new products. They come in several colors and sizes. There is also hard， soft， and medium.

　　Patrick： Are they cheaper？

　　Clerk： This one is 10 % off. That one has no reduction， but you can get a free tube of toothpaste with six toothbrushes.

　　Patrick： So if I buy a dozen， I'll get two free tubes of toothpaste？

　　Clerk： That's right.

　　Patrick： Good. I 'll take a dozen of them then.

　　Clerk： And here is your aspirin. What else did you say you want？

　　Patrick： Baby's wipes. Johnson's.

　　Clerk： Anything else？

　　Patrick： Well， actually I'd like to buy some vitamins for my son. He's five months old. Can you suggest any？

　　Clerk： Sure. Here you are. This one is excellent. Just mix one drop of it with milk.

　　Patrick： Thanks. That'll be all.