You will not pass the exam unless you study hardIf we do not protect the Earth we will not have clean water any moreYou will catch a cold unless you put on your coatI cannot buy a new computer unless ...
将词排序,完成句子,必要处加上逗号
You will not pass the exam unless you study hardIf we do not protect the Earth we will not have clean water any moreYou will catch a cold unless you put on your coatI cannot buy a new computer unless ...