Nick and Neo are not brother.They are f___

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• Last Saturday,Mary and Nick,w___ their dog,Pat,went to a forest.They a__ took Pat's favourite ball.The children sat down b___ the river there and gave the ducks some bread.Then Mary threw the ball to Pat,but he didn't catch it and it went b___ some trees.Pat ran to get it but he come back with s__ different in his mouth.It was a woman's handbag!Mary opened it c__ and then looked inside.She f___ a wonman's name and a phone number on a card.When they go
• Nick and Neo are not brother.They are f___
• 下雨时,常常是＂先见闪电,后闻雷鸣＂,这是因为光速比声速快的缘故.已知光在空气中传播的速度为3.0
• 下雨时，常常是“先见闪电，后听雷鸣”，这是由于光速比声速快的缘故．已知光在空气中的传播速度约为3×108米/秒，而声音在空气中的传播速度约为3.4×102米/秒，则光速是声速的 _ 倍．（