pls help

[samfat33]

Could anyone of you have a look at my answers and tell me if they are grammatically incorrect or irrelevant. Please suggest better answers.

Q1. Name two ways in which the post office serves the people.
A1. The two ways in which the Post Office serves the people are collecting and delivering letters, and renewing driving licenses.

Q2. What kind of uniform do postmen wear?
A2. Postmen wear green and brown uniform.

Which is the gerund?
Seeing is believing.
A.Both seeing and believing are gerunds.

[Anglika]

They seem fine.

You could say "Postmen wear a green and brown uniform."