单句翻译（每空1分，共10分）
1．这是我第一次给外国笔友写信。
2．你越努力, 进步就越大。
3．她一旦下定决心,什么也不能使她改变。
4．正是这次交通事故使他改变了对生活的态度。
5．他在作弊时，碰巧被教室外的校长瞧见。
1．This/It is the first time that I have __________ (a letter) to a foreign _______.
2．The _________ you work, the greater _________ you will/can make.
3．_________ she has made _________ her mind, nothing can change it.
4．It was/is the traffic __________ that (had/has)changed his attitude __________ life.
5． The headmaster outside the classroom ____________ to see/notice him while he was ___________ in the exam/examination.