Why did tea become so popular there?

Listen to the episode and fill in the gaps in the sentences below.

1. What could be more ___ , more unremarkable, more British, than a nice cup of tea?
2. In eighteen hundreds Britain was becoming an ___ nation.
3. ___ was used to help change the workers.
4. Of course, these days coffee is an ___ to tea.
5. The workers were required to be as ___ as possible.
6. Tea became Britain's favourite national drink in the ___ period.
7. Wow, that's a ___ number!