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To understand the complex situation completely requires more thought than ________ so far.

Principal White has been working in the school for about 20 years,      all his energy to teaching and researching as well as the running of a healthy school．

What do you guess our friend Bob          when we get to his home?

— Did you regret having left your well-paid job?
—Why should I? I _______ as much, but I enjoy my present one more.

—Did you hear about the air crash? I feel so lucky!
—Yes．If you _____ that flight, I _____ speaking to you now．

---- Would you like to go travelling with me to New York, Benjamin?
---- Sorry, I’m busy, for the final examination is coming. So I ____________ hard throughout the next several weeks.

---- How could I thank you enough?
----Don’t mention it. Any other man ________ that.

Jack could have avoided that terrible car accident, but he ________ careful enough.

--Could you tell me where you’re working now, Tony?
--In the new development zone. But I ________ in a computer company for five years.

—I didn’t ask for the name list .why       on my desk?
—I put it there just now in case you needed it.