Only one of these books is ________.
Along with the email was my brother’s promise ______ I came first in the competition, he would buy me an MP4.
"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.