Make a 2-2 1/2 minutes speech on a famous city you'd like to visit.(Final Exam Assignment)

Good morning, everyone! Did you ever hear about "The City of Fog (Frog)"? Yeah, today I want to introduce you to London, (to you,) though, I have to say Beijing is worthy of the same name now.
Well, last year saw the beginning of an underground train service (the first underground starts) in Hangzhou. (last year.) That's wonderful! But, did you know, the first underground in the world was (is) built in London?  And the London Underground in English is often nicknamed 'The Tube.' Today, Greater London underground system is divided into 6 zones, and there are 12 lines which are depicted with (have) their own colour coding. (colors.) For example, the 'yellow line' (golden Line) is the Circle Line, which is a busy line for travellers. (travel Line.)
It is well known that there are many famous buildings in London, such as the London Eye, Big Ben, etc., but the one I love most is Tower Bridge. Tower Bridge is a combined bascule and suspension bridge spanning (in London, England, over) the River Thames. It is close to the Tower of London, from which it takes its name, and (. It) has become an iconic symbol of London.
The city, itself, (It) is always clean and in good order (in London), and you can often (also) see pigeons and squirrels begging for food from (ask) passers-by (for food), as well as (or) deer roaming the parks. (in the parking lot.) A prosperous but old city with lots of history, that is (ancient traces city,) London. (,) I hope you can visit it someday. Thank you.

Yes, good descriptions Christina and it reads logically. Just a few points  - I think you meant to say 'fog' not 'frog'. London used to have this description and it was known as 'smog' - being a combination of the words 'smoke and fog'. However, the environment is much improved nowadays, so it is no longer known by this name. The Circle Line is the 'yellow' line in fact. Finally, you mentioned deer in the parking lots which is not unknown, but I think you meant in the parks, particularly 'Richmond Park' where they roam free.