I am not a teacher, but here is my suggestion:
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
- For Teachers