Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it.
I don't doubt ______ he has the ability to deal with the situation, but ______ the problem can be solved quickly depends on his attitude.
—I will buy you a mountain bicycle as a reward if you pass the college entrance examination.—______.
—Mrs. Smith! Tom has broken the mirror!—________ Such things happen.
Mr. Rod prefers a restaurant in a small town to _______ in so large a city as Beijing.
Have you heard news that he is ranked ________first in the competition?