【正文】 . Cave exploration. Potholing. Come to be known. The desire for solitude. The chance of doing something. Unexpected discovery. Lure people to do something. The depths of the earth. Give a satisfactory explanation. Peculiar fascination. Arouse instincts. Be dimly understood. Precise planning and foresight. Military operations. Rig up rope ladders. Establish supply bases. A descent can be made . precautions of this sort. Exact nature of the difficulties. Deepest known cave. Underground stream. Tunnel a course. The entrance to the cave. On a plateau. Barely noticeable. Since its discovery. Potholers’ Everest. Narrow gap. Climb down. Steep sides. Narrow corridor. Edge their way along this. Wade across. Shallow streams. Deep pools. Drop into. Underground lake. Plunge into. Rubber dinghy. Icy water. At the far end of. Wash up. Insistent booming sound. Shoot down into a pool. The roof of the cave. Squeeze through a cleft. Concert hall. Switch on. Rise up. Round about. Glisten in all the colors of the rainbow. Eerie silence. Drip continuously from. High dome.Lesson 43Fully insured. Insurance pany. Insure anything. Standard practice. Open air garden party. In the event of. Shipping pany. Make a claim. Local authority. Be unique. Annual fair. Hold a little party. Capsize and sink in. pie mittee. Recovery truck. Shivering in their wet clothes. Dive repeatedly into. Haul something out of. Serious problems. Attach hawsers and chains to. Be put into operation. Rise to the surface. Agonizing moment. Be perched precariously. On the bank of the canal. Slide back into the water. Be obliged to do. Fasten the chains. Start up. Haul above the surface. Set up a huge wave. Rebound off the other side of. At tremendous speed. Dry land.Lesson 44Travelling long distances frequently. Get cramped and stuffy. Take your mind off. Partial solution. Monotonous rhythm of. Click on. Lull you to sleep. In snatches. Get a sleeper. In the ceiling. Fumble to find. For inspection. Arrive at your destination. Long car journeys. On motorways. Travel fairly safely. At high speeds. More often than not. Service stations. Too much traffic. By parison. A great variety of. Civilized forts. Stretch your legs. Spacious decks. Get seasick. Ideal weather. Sea journeys. Take a long time. Holiday time. Have the reputation of. Hardened travelers. Be intimidated by. Have the disadvantage of . nothing can match them. Speed and fort. At a height of. Far above the clouds. Exhilarating experience. Devise ways of doing something. Take your mind off. Settle back. Deep armchair. Enjoy the flight. Sip champagne. On some services. There is plenty to do. Keep you occupied. Unusual and breathtaking view of the world. Soar effortlessly. Deep valleys. The shape of the land. Something is hidden from view. Extraordinary sight of unbroken cloud plains. Stretch out for miles. Shine brilliantly. One thing is certain. Fresh and uncrumpled. Recover from. A long and arduous journey.Lesson 45The power of the press. Democratic countries. Restrict the freedom of something. Be rightly condemned. Can easily be abused. Attract far more public attention. Political events. Extremely doubtful. Acting on the contention that. Facts are sacred. Cause untold suffering. Private lives. Exert such tremendous influence. Major changes. Ordinary people. Overthrow a government. Acquire fame and fortune overnight. Dramatically illustrates. Perpetual struggle against poverty. Be faced with. Pressing economic problems. Pass unnoticed. Struggle against. Economic odds. Live in obscurity. The parents of quintuplets. Radically change. The birth of the five children. The rise to fame was swift. Huge sums. Exclusive rights. Gifts poured in. unknown people. Be replaced by. Keep pressing for interviews. Act as spokesmen. At press conference. Oxygen tents. Hospital nursery. Pay the price for fame. Lead normal lives. The victims of mercialization. Market value. Instead of being. Bee a modity.Lesson 46Do it yourself. So great is our passion for doing something. Bee increasingly less dependent on. Specialized labor. Plead ignorance of a subject. Right tools and materials. Newlyweds gaily embark on. The task of. Leisure time. Install their own fireplaces. Lay out. Make furniture. Keen enthusiasts. Go so far as to do. Cater for . run special advisory services. Bits and pieces. Assemble at home. Excellent outlet. Pent up . creative energy. Born handymen. Tend to. Infinitely resourceful. Fix anything. Drive a nail in straight. Lights fuse. Furniture gets rickety. Pipes get clogged. Fail to operate. Put things right. Live under the delusion that. It is a question of pride. As much as anything else. Call in. lawn mower. Break down. Previous summer. Get round to it. Hear of. Fix it myself. Haul the machine into the garden. Have a close look at it. As far as I could see. Minor adjustment. A turn of screw here. Tight up. A drop of oil. As good as new. Repair job. Firmly refuse to mow. Dismantle it. Be littered with. Chunks of metal. Extremely pleased with. Trace the cause of the trouble. Insurmountable task of doing. Jigsaw puzzle. Reassemble it. For the simple reason. Curiously shaped bits of mental. Fit anywhere. Give up in despair. The weeks passed. Nag me to do. Be surrounded by a jungle. Buried somewhere. In deep grass. Rusting lawn mower. Lesson 47Overpopulated, over industrialized planet. Come to think about it. Deal with. Keep trying. Sh