配平下列化学方程式：

（1）　____ 　H₂+____ 　O₂=　____ H₂O

（2）　____ 　C₂H₄+____ O₂=　____ 　CO₂+____ 　H₂O

（3）　____ 　CuO+____ C=　____ 　Cu+____ 　CO₂

（4）　____ Fe₂O₃+____ 　CO=　____ 　Fe+____ 　CO₂

（5）　____ 　Cu+____ 　HNO₃=____ 　Cu（NO₃）₂+____ 　H₂O+____ 　NO．

    Denny Parker lived in a bad place. Because of a youth gang（帮派）, he wanted to leave the area. The gang often caused trouble in the high school. As he was walking out of history class one day, Denny bumped（撞上） into another student. “Sorry,” he said, and kept walking. But he was stopped. Turning around, he found himself facing a very large， angry boy. It was Bill Douglas, a member of the gang!

    “Hey，you pushed me!” Bill cried.

    “Come on, Bill,” answered Denny, “I said I was sorry.”

    “You're going to be sorry,” Bill said. “I will give you a lesson after school.”

    “Oh, no,” thought Denny, hurrying to his next class. “I'm in trouble now.” The more he thought about it， the more fearful he became.

    Then a word came to Denny's mind—courage. He decided to face it with courage. He had nothing to lose—except a few teeth. After school, many students waited on the corner. News had spread that there would be a fight． Bill Douglas and his gang were waiting, too.

    “Hey, Parker,” Bill laughed as Denny walked near. “Let me teach you a lesson.”

    Denny answered loudly, “Well, come on. I'm not afraid.”

    There was silence. Then the students began to applaud（鼓掌）.They cried, “Denny! Denny!” The noise was very loud. The gang members ran away one by one. Denny won with his courage.

经典诵读可以帮助我们提取丰富的历史信息。《三字经》“嬴秦氏，始兼并……迨至隋，一土宇……元灭金，绝宋世。太祖兴，国大明”中所反映的从长期分裂走向统一的朝代有(   )

19世纪60年代，在世界近代化浪潮的冲击下，资产队级统治在世界范围内得到进一步巩固与扩大。

材料一：这次改革虽然留下大量封建残余，但它却是俄国近代历史上的重大转折点。

——岳麓版《世界历史》九年级上册

材料二：日本新领导人……现在提出一个非凡的改革方案，宗旨在于建立一个强大的日本。……明治政府的首要目标是强化中央集权……

——摘自杰里·齐格勒(新全球史)

根据所学知识，回答下列问题：