By the time you get there tomorrow, they_____for beijing.
A. will have left
B. are leaving
C. will leave
D. are to leave
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I ______(write) a book at the moment.
The Chinese people are doing things on one ______(do)so far.
In 2 months' time he_______(finish)his reaining and start to work.
up till now I_______(spend) a great deal of money on books.