Any visitors to the production facilities must____a security pass from the information desk at the front entrance.
C
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All_____fortimeoffmustgothroughtheHumanResourcesDepartmentfirst.
In most countries, the metric system has been _____ for all measurement.
Youshouldnothavedriventhatcarwithitsbrakesoutoforder.You_____aserious
The little girl is ignorant _____ the basic rules of English grammar。