1:Please lock the door when you ( ).
(1)leave
(2)will be leaving
(3)will have left
(4)will leave
2:The man decided to wait at the station until his wife ( ).
(1)came
(2)come
(3)has come
(4)will come
3:It will not be long before she ( ) London.
(1)will leave to
(2)will leave for
(3)leaves to
(4)leaves for
解答と訳をお願いします