Complete the sentences with the given words in their proper forms（用括号中所给单词的适当形式完成下列句子。每空格限填一词）
【小题1】The boy showed the teacher his exercise paper to ______ that he had done it.（proof）
【小题2】We haven't ______ whom to stay with for the Spring Festival.（decision）
【小题3】A new kind of metal was ______ in a small village. （discovery）
【小题4】We can use link methods when we ______ English words.（memory）
【小题5】Alice has told us that the ______ place she has ever travelled is from Shanghai to Sydney.（far）
【小题6】Has Tina ______ cheating in the exam yet? （admit）
【小题7】A ______ happened in the bank near my home yesterday. （rob）
【小题8】As a detective, his job is to find the ______. （guilt）