Scientists are convinced _______the positive effect of laughter ______ physical and mental health.
A. of ; at B. by ; in C. of ; on D. on ; at
Many of them turned a deaf ear to his advice, ________ they knew it to be valuable.
A. as if B. now that C. even though D. so that
It is so difficult a question_______ none of the kids could work it out.
A. as B. that C. which D. X
Kunming is called “Spring City”, but it _____ snow in winter.
A. shall B. can C. must D. might
The old black woman sat under the pine tree, her grandsons, ______ around her, ______ to an old story.
A. seating; listening B. seated; listened C. seating; listened D. seated; listening
He was elected______ president of the company, and _____news came ,in fact, as ______surprise.
A. a; the ;X B. X; the ; a C. a; X; the D. the; the; a
