请解释一下下面的问题
1.——Why!Where's my passport?Maybe I left it on the plane.
——My Goodness!You____things behind.
A.had never B.didn't leave C.never left D.hadn't left
(另外,此句中“why!”是什么意思啊)
2.——What ____you the chance to see the film?
——Attending the meeting.
A.cost B.took C.spend D.paid
3.The other day,my brother drove his car down the street at____I thought was a dangerous speed.
A.as B.which C.what D.that
4.He was always ready to help others and never expected that what he did would____one day.
A.pay B.pay back C.be paid back D.be paid off
5.——How long will the food____?
——Five days.
A.be lasted B.go on C.last D.stay
答案是CCCAC啊,同志们。解释一下吧