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   Earlier this year，a 3-year-old boy from Guangxi died after being left in a car for several hours in the hot afternoon sun.Horrible as it may sound，it is quite a （1）

common

common

[?k?m?n] story across the world.Could a high-tech device（設備） save a child who is （2）

locked

locked

（lock） in a car before it's too late？Three high school students at Guangdong Experimental High School may have the （3）

answer

answer

to this question.They made a device using a sensor to monitor（監控） both the temperature and level of carbon dioxide in a car.Once the levels become too high，the device will （4）

produce

produce

[pr??dju?s] cool air.The invention，which ensures the （5）

safety

safety

（safe） of passengers in cars，helped the three teenagers win the gold medal at the 2017 Invention & New Product Exposition in the US.
   Thanks to the science and technology courses at their school，the students armed themselves with the knowledge needed to get the job （6）

done

done

（do）. "Inventing a device is not as hard as we thought，" said Tao Yiwei，16，a member of the team. "Instead，I got a （7）

chance

chance

[t?ɑ?ns] to take part in hands-on practice and develop my teamwork skills."
   Now，the team has become well-known to all.The reason why they （8）

stood

stood

（stand） out is not only because of the advanced technology they used，but also because of the human interest side of their invention.After noticing some social problems，this group of young man came up （9）

with

with

different ideas to try to solve them.And that's the true meaning of their project，which can certainly lead us （10）

to

to

a better world bit by bit.