用所给动词的适当形式填空。

     It was Sunday . My little brother 1_________ (make) a kite when I came in .I2___________(turn)

on the television and began to watch a football match. Suddenly I heard him 3_______ (cry) .I ran up to

him .His hand 4_________ (hurt) .Neither of my parents 5_______(be)  in and  I had  to take him to a

hospital. Bad luck! Something was wrong with my bike. I  6_________(hurry) off, with the boy on my

back. It  7________ (rain) at that moment and I was very tired when we 8__________(get) to the bus

stop .On our way home ,the rain  9________(stop).My brother   felt sorry.He said to me ,"Thank you ,

sister ,I 10________(remember) this accident for ever!"

有A、B、C、D四种单质，在通常情况下，A、D是无色气体，B是红色金属，C是黑色粉末．现进行下列实验：

①在D中加热B，会生成一种黑色固体物质；

②C与①的生成物混合，在高温下反应生成B和另一种无色气体；

③向①的生成物中通入气体A，并加热，也能得到B，并生成水．

（1）根据以上实验，请分析推断并写出下列物质的化学式．A．______  B．______ C．______

（2）写出实验②发生反应的化学方程式：______．