Viết lại câu thì hiện tại hoàn thành và quá khứ đơn

Viết lại câu thì hiện tại hoàn thành và quá khứ đơn:                                                                                             
50.When did you learn to drive?
How long is it ____________________________________________________
51. The last time I went swimming was when we were in Spain.
I haven’t ________________________________________________________
52. You haven't tidied this room for weeks.
It’s weeks _______________________________________________________
53. We started looking for a flat 2 months ago and we are still looking.
We have ________________________________________________________
54. This is the first time I've been to a night club
I haven’t ________________________________________________________
55. They have never heard such a thing before.
This is the first time ________________________________________________
56. Noone has challenged his authority before.
This is the first time ________________________________________________
57. She left university 2 years ago
It is _____________________________________________________________
58. My mother was the most warm-hearted person I've ever known.
I have ___________________________________________________________