The workers were pouring concrete __________ the engineer checked the plans., while, meanwhile, at the same time, The crane stopped working __________ the builders were lifting steel beams., during, when, The electricians installed the wiring. __________, the plumbers worked on the pipes., At the same time, During, Meanwhile, __________ the inspection, the supervisor examined every floor carefully., When, Meanwhile, During.

Meanwhile,during,while,when

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