Read the passage below and choose one correct answer for each question.

“Where is the university?” is a question many visitors to Cambridge ask, but no one can give them a clear answer, for there is no wall to be found around the university. The university is the city. You can find the classroom buildings, libraries, museums and officers of the university all over the city. And most of its members are the students and teachers or professors of the thirty one colleges.

Cambridge was an already developing town long before the first students and teachers arrived 800 years ago. It grew up by the river Granta, as the Cam was once called. A bridge was built over the river as early as 875.

In the fourteenth and fifteenth centuries more and more land was used for college buildings. The town grew much faster in the nineteenth century after the opening of the railway in 1845. Cambridge became a city in 1951 and now it has the population of over 100,000. Many young students want to study at Cambridge. Thousands of people from all over the world come to visit the university town. It has become a famous place all round the world.

After which year did the town really begin to develop?