[imanuragjain]

I am not a teacher, but here is my suggestion:
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1) If I say: I've got some questions for you, would it be better to say: I've got a few questions for you?

- Correct statements:

I've got some questions for you.
I've got few questions for you

2) how to say an address in words. For instance: 40/1 XYZ Street ?

- 40 by 1, XYZ street

3)The death of a young and charismatic President little more than two monts eralier had cast a pall on the national mood

- `On' the national mood

4) The sound lasted about 5 or six seconds

- The sound lasted for around 5 to 6 seconds