A task of the post office staff is to_ (class) mail according to the places it is to go
It is essential that everything in advance.（）
Expertshavefoundthatnormalsleepcanbedividedintofive______stages
每个人都是平等的，不管他是总统还是马路清洁工。翻译
Ifyouhadbeeninbetterhealth,we___(allow)youtojointheminthework.
