______ is announced in today’s paper, they have succeeded in solving many problems in accordance with the new theory.
"We can’t go out in this weather," said Bob, ________ out of the window.
Scientists are convinced _______the positive effect of laughter ______ physical and mental health.
Many of them turned a deaf ear to his advice, ________ they knew it to be valuable.
It is so difficult a question_______ none of the kids could work it out.
Kunming is called “Spring City”, but it _____ snow in winter.