I have two questions

[manywords]

question one: You can take the No. 5 bus. OR You can take No. 5 bus. Which is correct?
question two: When did you last go to the cinema? What is the difference between "last" and "lastly". Can you make a centence with "lastly".
thanks

[Mister Micawber]

1-- Either is fine.

2-- Firstly and lastly replace first and last in enumerating e.g. steps (First[ly], one opens the battery case; second[ly], one inserts two AAA batteries...), but do not normally occur in other formations. I myself consider these -ly forms awkward, useless and rather pompous hypercorrections, and I have my students avoid them in their writing.
.

[manywords]

Thanks a lot.
It is the examining sheet that require the exact usage of the words, here in China!