What was John doing in a shop?John was trying on ______ . [originaltext] On

One afternoon, John was trying a new jacket in a shop. He looked at him in the mirror and thought it was very good. He took off the jacket and told the shopkeeper to put it into a bag. At that moment his friend Peter came in. they haven’t seen each other for months. They were so pleased to see each other in the shop that they talked on and on. Then they decided to have dinner together. John picked up the bag and began to leave. The shopkeeper stopped them and asked John to pay for the jacket. John looked surprised but soon realized what the matter was. He said "sorry" to the shopkeeper and then paid the money.