The ________ of the cottage were covered with ________．
A.roofs ; leafsB.roofs ; leavesC.rooves ; leafsD.rooves ; leaves在线课程B
解析：
roof的复数形式是直接加s构成roofs，同类词还有gulf, belief, chief等，而leaf的复数形式是将f改为ves，同类词还有knife, shelf, half, wolf等。