15. An awful crash between an express train and a bus _____ , however, occur the other day in Russia.A. does B. did D. has to D. had to
What ________surprise you gave us by wearing such funny________ at so serious a meeting!
--- How about the debate held in your class? --- ______
Knowledgeable as he is, the expert was unwilling to offer advice to ______ he thought was not qualified.
Don’t ______ life’s small joys while searching for the big ones.
Delta, the American airline, is sometimes jokingly explained “Don’t expect your luggage to arrive” because it ______ be very slow.