求2道初中英语奥林匹克题-did you enjoy yourself at the party?-he__ ,but

求2道初中英语奥林匹克题
-did you enjoy yourself at the party?
-he__ ,but he __
A managed,was turned in B tried was turned down
C did ,turned up D didn't ,turned on
2.this maths problem is too difficult for me to ____ _____
为什么答案是 work out 而不选work it out呢?{共两选项}