Over the past decades , sea ice in the Arctic as a result of global warming .

I’m fond of my sister, but she has a serious shortcoming. She _______ be really stubborn. [ ]

I enjoyed the TV series very much. I wish I _______ the book from which it was made.

_______ ways to get on well with your classmates, or you will get yourself very lonely. —OK, I’ll try my best.

____ the temperature falling so rapidly, we couldn’t go on with the experience