Grammar mid term exam revision

1- This is the fastest car she has ever driven.
2- (cancelled)
3- The last time the students had a trip was 2 months ago.
4- I still haven't finished writing the report .
5- This is the funniest film I've ever seen .
6- Mike has been studying medicine for four years.
7- It is my first time to meet a film star.
8- It is his first time to play football .
9- I've never seen such a kind man.
10- The last time john played was years ago .
11- Ahmed has just started business .
12- We were sitting down to tea when the door knocked .
13- (cancelled)
14- While i was dreaming the alarm rang.
15- Nader hasn't travelled by train for a long time .
16- They haven't discovered a cure for cancer yet.
17- I've been running my own business since 2011.