These are our _____ for doing itA.reason B.cause C.reasonsD.causes

These are our _____ (watch) These books are _____. 单数句是啥?These are our broths(改为单数句） _____ ______ my brother.应填啥? These are our _____ for doing itA.reason B.cause C.reasonsD.causes Are these your _____(letter) Whoes _____(book) are these These are our pens .They are（）. These are our clothes.T_____ are over These are our oranges. Those are()(their) These pictures are very good.----_____ _____. What are these?_____ _____ photos. _____(that) are apples. These are oranges. These are our bags where are____(they)? These are our apples改为单数 these are our apples改为单数句子 These are our books改成单数 These are our books.(改成单数） These are our chairs.Those are____(their)