---Have the papers been graded? --- Yes, but I regret that you failed it.
--- Shall we take the 10:20 train? --- No. If we took that train, we ________too late.
--- I had thought he would be nervous in this speech competition, but he turned out to be calm. --- He________quite enough preparation for it.
Don’t give up regardless of difficulty and failure, ________ you’ll never achieve your goals.
--- Have you got any books on English grammar? I’d like to borrow __________. --- Yes, here you are. But you must return it by Friday.
David got a higher grade in the final exam, for, you see, he made______mistakes.