the article______(write)by an exchange student last month

the article______(write)by an exchange student last month exchange student前加不加the By the end of last month中的by是什么意思? the exchange student came to this university last year.改为同义句 exchange student 前用a还是an? how to be an exchange student he read an article by Han Han last month.（用next month改写句子） by the end of last month 上个月末? The price of eggs _____ by 10％ since last month. by the end of last month ,they___(build)five bridge What's the mean of exchange student? the month before last