根据句子的意思和所提供的汉语，补充句子，使句子通顺完整。
小题1:他日夜工作以还清债务。
He worked to pay off the debt.
小题2:我急切盼望你的回信。
I’ m your reply.
小题3:他考试作弊，怎么没受到惩罚呢？
How did he cheating in the exams?
小题4:Don’t bother to look for my umbrella; it will ________ ________some day. (出现)
小题5:The race was so close that everyone was ________ ________ ________ at the finish. (屏住呼吸)
小题6:He couldn’t ________ ________ his foolish mistake. (作出解释)
小题7:经济危机首先在美国爆发。
The economic crisis ________ ________ first in the United States.
小题8:I must ________ ________ this morning and do the cleaning. (安下心来)
