It is useful book.—Yes, it tells us how to play football.

A study shows that a kind of fish in America can live_______ water for up to 66 hours. [ ]

With 4G mobile phones, people can even see each other as they talk. —-Really? Would you show me it, please?

My parents showed__________ some old pictures that brought back sweet memories．

We don’t know _________. She is new here.