1. (2022八上·余姚竞赛) 用方框中所给单词的适当形式填空，使对话通顺、正确。每词仅用一次（每空一词）。

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People use robots everywhere. They are playing important role in our life. Scientists are now studying nanorobots(纳米机器人 ).They are different from the common ones. They are pretty small in , so they can even go into our blood vessels( 血管).

Nanorobots will be good helpers of doctors. Every year a lot of people die of dancer(癌症).With nanorobots' help, however, cancer will never be terrible. These robots are able to carry medicine into the human body. They will find out cancer cells (细胞) and kill them without healthy ones. Scientists are surprised that they can find their way out after they finish work inside the human body. Maybe it seems like a science story, but you can believe it will come true some day in the near future.

Will you be in working with a nanorobot when you grow up? Just get ready from now on. Everything is possible.