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)day and night
网友回答
(答案→)day and night
解析：
【小题1】考查词组：日夜day and night
【小题2】考查词组：盼望，和be动词连用用looking forward to
【小题3】考查词组：逃避惩罚：get away with
【小题4】考查词组：出现turn up
【小题5】考查词组：屏住呼吸，和be动词连用用holding his breath
【小题6】考查词组：作出解释account for
【小题7】考查词组：爆发，用过去时broke out
【小题8】考查词组：安下心来settle down