While most people are learning to sort rubbish，a student in Hangzhou does something than that -- he created a smart bin by（1）

himself

himself

（he）.
    Jiang Haotian is a ninth grader.His smart bin is made up （2）

of

of

two small bins，each with a cover on its top to open or close.The bin can carry out people's instructions.For example，（3）

when

when

people say "recyclable waste（可回收垃圾）"or "unrecyclable waste"，the correct one out of the two small bins will pen.When it's full of rubbish，the bin will not open.In this way，it won't smell terrible.Also，the bin will make a loud sound if someone （4）

throws

throws

（throw）burning things in it. "It helps stop fires，" Jiang says.
    Jiang came up with the idea of（5）

making

making

（make）a smart bin to sort rubbish when he was in Grade 5.One day，he helped out the rubbish and （6）

a

a

dustman told him not to mix all kinds of rubbish together.But he couldn't carry out his plan until he took （7）

classes

classes

（class）which taught him to program.（編寫程序）
    To make the dust bin as perfect as possible，Jiang （8）

wrote

wrote

（write） lots of codes.He visited different places and asked for advice.After two years of hard work，he（9）

finally

finally

（final）completed his design.He is proud that he can do something for the environment.He hopes that more people can join him and make the Earth much（10）

cleaner

cleaner

（clean）.