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___________________________________________(这项政府工程的目的) is to ensure food safety.

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_______________________________ (充足的电力供应) is necessary for economic development.

__________________________________ (你必须记得把文件保存下来) before you turn off the computer.

______________________________________ (你无论在什么情况下都不可告诉他) what has happened.

What________________ (prevention) you from joining us last night?