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
If _____ the same treatment again, he’s sure to get well.
——What about _________ job? ——It’s too difficult _________ job for me.
--Can you finish the writing on time? --_________.
—I’d like a pen which _________ well.—Will this one _________?
—Why not go out for a walk before breakfast? —Oh,yes. _________ is my favorite time of day.