He failed again and again. But through his hard work, he succeeded .

A. first of all B. at the beginning C. in the end D. in a short time

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Many companies use guards and expensive alarm systems (報警系統(tǒng)) to protect their property (財產(chǎn)). Soon a new kind of protection will be used—robots. Engineers have been working on the first mobile robots for businesses. The robots will patrol (巡邏) factories, warehouses (倉庫), and museums at night.

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