You should be _______ (responsibility) for yourself.
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I'm sorry to learn that you have made no ______ (improve) on the design at all.
It's rather difficult for me to make such a _______ (decide).
They stopped ________ (talk) when the teacher came in.
He suddenly remembered that his schoolbag_____ at home.
A. has been forgotten
B. had been forgotten
C. has been left
D. had been left
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