根据首字母或汉语提示写出单词的正确形式，每空只填一词。
He isn’t my friend. A ____________, I don’t know him at all.
Susan looks very ____________ (不安的); I should do something to make her happy.
I’m glad that John was ____________ (说服) to take part in the English party.
Years of fighting has left the area in ____________ (废墟).
The balloon ____________ (突然破裂) and the child let out cries.