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　　Nowadays, there are more and more                                 in some big cities. It is estimated that                                .(用具体数据说明某现象)

　　Why have there been so many               ? Maybe the reasons can be listed as follows. The first reason is that                           .(原因一) Besides,                            .(原因二) The third reason is                           .(原因三) To sum up, the main cause of is due to                                     .(指出主要原因)

　　It is high time that something should be done. For one thing,                                   .(解决建议一) For another thing,                                          . All these measures will certainly             .(解决建议二)

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