`a)` True

`-` Dẫn chứng: London is Britain's biggest city.

`b)` True

`-` Dẫn chứng: It is a very old city and dates back to the Romans 

`c)` False

`-` Dẫn chứng: London is very crowded in summer.

`d)` True

`-` Dẫn chứng: It is a popular city with foreign tourists and has more than eight million visitors a year. 

`e)` False

`-` Dẫn chứng: London has an excellent underground railway system, so it is easy for tourists to get around.

`f)` True

`-` Dẫn chứng: There are plenty of good restaurants where you can get excellent British food. The city also has lots of good Indian, Chinese, Japanese, French, Italian, and Greek restaurants.