1.--_____ you ____( hear) what they _____(talk) about?--I'm sorry I can't.

Can you hear what they talking about
They have not clean the blackboard and floor yet
My mother was watching TV when I left home.She asked me post a letter for her.
Oh,it _____(rain) again. ____it often ____ (rain) at this time of the year?The rains _____ (stop) now. Let's go out to playOh, it rains again. Does it often rains at this time of the year?The rains stop now. Let's go out to play._____ family is much bigger than _____.A.Our;theirB.Our;theirs C.Theirs;ours D. Theirs;our最后一个，答完就OK了Our family is much bigger than theirs.=> 选B这里的theirs等同于their family.如果有E. Their; ours, 那么也是对的: Their family is much bigger than ours. √