请问it was worth saving two boys at the cost of three students

请问it was worth saving two boys at the cost of three students Two fifths of the students in our class ______ boys. It was only three weeks later that we arrived at the foot of Two_______(three)of the students in our class are boys.单词正确形 in our class( ) of the students are boys A.three fifths B.th .two thirds of the students are girls and the rest (are)boys the cost of dry-cleaning is three times that of ordinary was but at the cost of losing their own.two thirds of the people Two _____(five) of the students in our class are boys.1.填什么 at the cost of意思 英语翻译the castles are worth the cost of entry alone. 英语翻译请问I was,it's just not working out between the two of us.