求各位大仙指导.

求各位大仙指导.
1.That was the steepest mountain they_____ .
A.would climb B.have climbed C.had ever climbed D.was climbing
2.By the time John hurried to the airport,the plane ______.
A.took off
B.had already take off
C.had already been taken off
D.was taken off
3.Little Tom is generally healthy,but every now and then he ____ a
cold.
A.has caught B.is catching C.will catch D.catches
4.Betty ______ homes for several days,which made her parents very worried.
A.has left B.had been away from C.has been away from D.had left
5.-Did Uncle Wang say he would come?
-Yes,but he didn't say if he _____ dinner with us.
A.had B.had had C.would have D.will have