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Mr. Black has a shop. He works in the shop by himself all day, so he feels very1and tired every day.

It was2Sunday morning. Mr. Black didn't feel well, so he went to see his doctor. The doctor asked him3, and looked him over carefully. After that, he left the room, and4back with three different bottles of pills .

Looking at Mr. Black, he said,"5the green pill with a big glass of water when you wake up. Take the blue pill with a big glass of water after you have lunch. And before6to bed, take the red pill with another big glass of water. "

Mr. Black was very surprised, he took so7medicine and asked the doctor, "Mmm… doctor8is wrong with me?" The doctor answered. "Mr. Black, you are not drinking enough water."