Blank Filling (注:使用文中出现的词或短语) When Hitler decided to launch his 1 侵略 ) of Russia, he thought that nothing could 2 3 4 5 ( 阻挡 ) of his armies. The 6 ( 征服 ), it seemed, was inevitable. He had surprise attack on his side and 7 Stalin 8 9 ( 使措手不及 ) by 10 ( 发起 ) his attack without a 11 ( 宣布 ) of war. Hitler expected the 12 (军事战役 ) to last only a few months. In the event, it was to 13 14 ( 拖延 ) for much longer. Like Napoleon before him, he had made a fatal mistake in failing to 15 16 ( 考虑 ) the severity of the Russian weather. Many German soldiers died of the cold as winter set in, which 17 the German advance 18 19 20 ( 使停止 ) .