_______stones ________ fire in ancient times?A.W

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• _______stones ________ fire in ancient times?A.W
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• 英语中“被用什么制作”be made of 还是 be made from还是 be made with?书上有一句是It was built with stones and bricks in ancient times.be built with 是专用词组吗？
• 积的乘方应用题一道把边长2a的一些小立方体堆成一个大的立方体,当小立方体只有一个时,看到的小立方体有1个,看不到的是0个；当小立方体8个组成大立方体时,看到的小立方体是7个,看不见的是1个；当27个小立方体组成一个大立方体时,看到的小立方体是19个,看不到的有8个；……根据上述规律：1.求当小立方体有216个时,看不到的小立方体的个数及这些小立方体的体积；2.当看不到的小立方体为（n-1）^3个时,求整个大立方体的表面积.
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