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insulation
mastery UK /ˌɪnsjʊˈleɪʃən/ US /ˌɪnsəˈleɪʃən/noun
card 1 of 5 · fill in the blank
The contractor _____ thermal insulation in the ceiling to improve comfort and reduce energy costs.
card 1 of 5 · fill in the blank
The contractor _____ thermal insulation in the ceiling to improve comfort and reduce energy costs.