_______ difficult the task may be, we must finish it on time, because we can’t miss _______ a precious opportunity.
I ____ to send him a telegram to congratulate him on his marriage, but I ____ it.
—It’s a long time since we met last. Haven’t you graduated from college yet?—_____. I ______ English for four years in Nanjing University.
Unluckily, when I dropped in , Dr. Smith ____, so we only had time for a few words.
—We didn’t find Smith attending the lecture.—No one ___ him about ___ a lecture the following day.
—The former president of Iraq was caught at last.—Really? Where himself?