Swimming is good _____ our health, but at the same time we mustn’t forget the danger. [ ]

I’m still working on my project.—Oh, you’ll miss the deadline（截止期限）. Time is________.

She told me the sun ______ in the east.

There is still a copy of this book in the library. Will you go and borrow _________? –No, I will buyin the bookstore.

He isn’t _____ his father, but he _____ his father very much. [ ]