Oxford Progressive English Course Book 2 [antikvár]

READING-TEXT ONE MENDING A PUNCTURE The front tyre of John's bicycle is flat. John has a puncture. John has not much money, so he does not want to take his bicycle to a bicycle repair shop. He is going to repair the puncture himself. He has taken the narrow little box from the tool bag at the back of the saddle. He is now going to start work. First he must get the inner tube out. John has just pulled the inner tube out. This tube has no air in it. John wants to find where the puncture is. How will he do this ? First he will pump air into the tube. Then he will put the tube into a bucket or bowl of water. He will pull the tube round slowly through the water and watch it carefully until he sees bubbles of air. John has pumped up the inner tube. It is füll of air now. John has taken a bucket to the kitchen tap. The bucket is nearly füll. What is John doing now? He is holding part of the tube in the water. He is trying to find the puncture. When he sees bubbles rising from the tube, he will know where the puncture is. I Ü