If you ____ the chat room ten minutes ago, you ____ what we were talking about

Is that ________ ruler No, it’s _________ orange.

Professor Smith, can I meet you at 10 o’clock tomorrow morning?—Oh, I’m sorryI a lecture at Hunan Normal University

I’ve just heard that the lecture (讲座)to be given by Ma Yun,the Alibaba CEO,has been cancelled(取消).—-Oh , no!__________ .

Thank you for ______my grandpa when I wasaway.