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生孩六月，慈父见背。

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At the beer-drinking contest the winner drank an average of 10 bottles of beer at the first 20 rounds. After a further 20 rounds the average increased to 15 bottles. What is the average for the last 20 rounds

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Marco Polo was born in Italy in 1254. He was the most (76) f westerner to visit China during the Middle Ages. He wrote a (77) b about his travels. He described all the things he saw and heard. Many people read the book, but (78) f believed what he said. He spoke of places and people that he knew about at that time. His father, Nicolo Polo, and his uncle were (79) wea traders, who regularly traveled to parts of the East. They visited China and became friends with Kublai Khan, the great Mongol (80) em. It was only when they (81) re to Italy from China that Marco, who was now 15 years old, first saw his father. Marco decided to accompany them for their next trip. It took them more than three years to travel the 9,000 miles to Shangtu, (82) cap of the Mongol Empire. Kublai Khan had many palaces and Shangtu was the one he used in the summer. It was (83) si in the mountains south of the Gobi desert. Every year when (84) su was over, he and his friends moved down from Shangtu to Dadu in the lowlands. This was his winter (85) p and it is now called Beijing.