Looks are not ______. It’s what’s inside you that really matters.

His sudden look of fear made _____ clear that he had something to do with the matter．

Understanding the cultural habits of another nation，especially ________containing as many different cultures as America，is a difficult thing.

—Hi, what’s wrong with the girl from Japan?    —Oh, she feels lonely, she has ________friends in China.

I can’t connect my computer to the Internet. There must be ________ wrong with it.