用括号中所给词的适当形式填空
How________(fool)the boy is！He is always making the same mistake．
I felt very________(embarrass)when the teacher asked me to stand outside the classroom．
What an________(embarrass)moment it was！
All the tickets had been________(sell)out．
They got________(marry)two weeks ago．
We were proud of his great________(discover)．
She couldn’t see the plane．It________(appear)．She didn’t know where it went．
We all believe the story because it is very________(believe)．