12 . We have not seen the picture of our city as it looked 100 years ago.

13 .  The advantage of having a car is that you don’t have to rely on public transport.

14 . It was at the age of 14 that Jack London left school and became a sailor.

15 < Neither the boy’s teacher nor his parents are satisfied with his progress.

12) We haven’t seen the picture of our city as it looked 100 years ago.

13) The advantage of having a car is that you don’t have to rely on public transport.

14) It was at the age of 14 when Jack London left school and became a sailor

15) Neither the boy’s teacher nor his parents are satisfied with his progress.