My initial guesses:
Problem A: 3
I think I am in the wrong seat to convert the double, so I will bid. Partner should know that if I had clubs, I would bid them, and if I were rich, I would have made an immediate responsive double, so this is asking for a 3-level best major. (I would probably have made a responsive double on this hand, but you live with the traveled path, not the one wished for.)
Problem B: 2
My preference would have been to bid diamonds, anticipating the heart bid, then I could show spades. Since I did not do that, I feel I am stuck with taking the hint, rebidding my spades to show the weakest action.
Problem C: 3
Partner should have five, so I may as well raise and let him know of the fit. Tempting as it may be, I don't want to reverse into clubs for a delayed support (implying diamond shortness).
Problem D: Dbl I am torn between 1NT and double. 1 NT is right on points and shows the stopper, but the stopper is badly placed if West can find an entry to East early. The hand has the right shape for the double, but if partner chooses diamonds, the support is very anemic. I would be pleasantly surprised to hear a pass from partner if I double, but with me holding the AQ, I don't expect that to happen even with a stack.
Problem E: 4
I hate opening 2
with a two-suiter, but having done so, I will rebid my spades and hope partner can figure out what to do next.
Problem F: 6
This one will require additional thought. Partner opened and supported by six-card suit at the four-level. I have first-round control of all suits, and the opponents are showing a lot of length in my void. I am very tempted to trot out 5 NT (grand-slam force - bid 7 with 2 of the top three trump). Walking the dog may allow me to buy the grand, where the GSF may lead to the 7
sacrifice.
Problem G: 3
I hate splintering into a singleton ace, but a slam is very possible, so I need cooperation. A diamond cue-bid would be wonderful.
Problem H:
A I suspect I need to produce a Deschapelles coup, so I will look at dummy to decide which suit I need to lead to attack dummy's entry.