In the following article, some sentences have been removed. For Questions 1-5, choose the most suitable one from the list A—G to fit into each of the numbered blank. There are two extra choices, which do not fit in any of the gaps.

　　On the ground floor of a five-story building in Rome, Italy, a lead-aproned man carefully places a 400-year-old painting on a table. Then he steps back and flips the switch of a 50,000 volt X-ray machine. Nearby, another painting is being wheeled into a special oven. Elsewhere the buzz of a power saw is heard from behind a closed door. Two workers are cutting the back off a 500-year-old wood panel painting.

　　Such things happen every day at Rome's Institute of Restoration. 1)

　　In terms of art treasures, Italy is one of the richest countries in the world. Yet until 1939, when Italy's government founded the Institute, the country's museums had to hire private restorers for cleaning and repair jobs. Says Doctor Urbani, "Most of the restorers did not have proper training. They often did more harm than good."

　　No wonder they did harm. 2)

　　3) Sometimes they even changed the picture.

　　Any number of things can damage a work of art. Smog eats away at stone and metal. Insects chew wood. Moisture causes wood and canvas to swell, shrink and finally rot. For one art show, a painting was flown from England to Rome. During the flight, the canvas shrank so much that the paint lost its grip and began peeling. When the box was opened in Rome, there was a half-bare painting—and a pile of tiny colored flakes.

　　Doctor Urbani remembers, "The painting was rushed to us. It looked hopeless. But we never give up on a case." After months of slow, careful work, every piece of paint had been puzzled back together and glued on a new canvas. The job was so well done that no damage could be seen.

　　When a painting arrives at the art hospital, it goes to the laboratory, where scientific work is done. Infrared and ultraviolet photographs are taken. 4) Newer coats of paint stand out as dark spots against older coats of paint. If there seems to be a different picture beneath the one showing on the surface, the painting is finally X-rayed.

　　Paintings on wood are then carried into a boxcar-sized room. 5) For 24 hours, a deadly gas seeps into all the cracks in the wood to kill hidden bugs and their eggs. Paintings on torn canvas go to a room where new cloth backings are glued and ironed on. Finally the paintings are ready to be given new life by one of the restorers.

　　[A]Instead of just touching up damaged spots, most early restorers painted over them with a heavy hand.

　　[B]Using these photographs and an analysis of the paint, it began removing dirt and old, yellowed varnish with cotton dipped in a special liquid.

　　[C]Headed by Doctor Giovanui Urbani, the men and women here work at keeping works of art in good health.

　　[D]These photographs make it possible to see through the thin top coats of paint to find out if the painting has been touched up or painted over in the past.