Помогите пожалуйста,кто разумеет британский!Изберите верный вариант: a. a b. an c.

Помогите пожалуйста,кто разумеет английский!Изберите правильный вариант: a. a b. an c. the d. --
Oxford is a small city in 1____ centre of England. 2 ____ University of Oxford is one of 3____ most famous in the world. If you are 4____ student, its a great place to study. For visitors to Oxford there are a lot of things to do. You can go to museums and theatres. There are also 5____ shops, cafes and restaurants, and of course bookshops. Theres 6____ famous bookshop on Board Street. 7____ shop has thousands of books and is over 120 years old! Summer is 8____ best time to visit Oxford. When 9____ weather is nice, you can hire 10____ boat on one of the rivers or have 11____ picnic in 12____ university parks. Oxford is also close to London so you can easily take 13____ bus or train there for the day.