1.The sheathing or inner layer of the outside wall... nailed to the studs a) may be wood fiberboard or plasterboard b) may be cement fiberboard or plasterboard c) is necessary to be wood fiberboard or plasterboard 2.The area within...is the basement a) the house below the second story; b) the foundation below the first story; c) the foundation below it. 3.If the circuit becomes over loaded,... a) it is necessary to telephone for an electrician for help; b) the circuit breaker automatically cuts off the current c) it is necessary to switch off the light.