Q8 Answer

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DBL. You cannot overcall 2H as you only have 4. You could say 2D but again you only have 4, with ten HCPs you could DBL saying you have 3 or 4 in the majors.

2D. If you only bid 1D with 4 diamonds then you would bid 2D. This system means that you occasionally bid clubs with only 2 cards.

With 16+ HCPs you can bid a strength DBL.

When you pre-empt it is best not to bid again.  

The only time you MUST bid again is when partner responds to the pre-empt with a change of suit, which is forcing. So PASS