--The mistake_____, I had been more careful.---But you weren’t at that time.
On the top of the hill __________ the old man once lived.
The boy looked very ______; he must have seen something _____ on the way to school.
It took me over two hours to _____ Robert to change his mind, because he was too stubborn.
If you ______, you agree to do something that you do not want to do.
—How long ____ in Guilin, Nancy ?—About a week. I’ll give you a call when I arrive there.