Professor Backman took up scientificresearch for decades，and this is________he devoted all his life to.

The man in the blue shirt is thanthe man in the white shirt.

He was about to leave ______the telephonerang; ______was from his mother

－The novel is, I have to say, not a bit interesting, How do you find it? －Why! It’s ____________ that I have ever read.

my bills, ________ buy a new car.