Do you know the song Gangnam Style? —Of course. It interesting.

Each of us has to write a ________ report every two weeks．

It’s necessary _____ us _____blind people cross the street.[ ]

I think her dress comes from the 1970s.—It_________ be from that time. It looks so modern on her.

Do you know the teacher ____ classes are interesting and exciting?— Yes, she is Mrs. Zhang.