He is unable to make himself at the coming meeting, which makes him worried.
A. to be understood
B. understanding
C. understood
D. understand
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As teachers, we need to take (responsible) for looking after our students' health.
They had worked hard to earn more money in order to give their daughter a good (educate).
I knew it was a difficult (decide) , but I have already made up my mind.
Mr. Brown is a nice person, but he's not much of a (n) (think).