I'll take the beginners approach (and assume a full ten person table).

1) Call, I feel about 75% sure we have the best hand and are likely up against a low pp or weaker Q. Call instead of raise b/c this kind of uncertainty, I'd rather have a smaller pot. The opponent has to have in the back of his mind that you may have flopped a full house.

2) Call, with the extra caution for an another spade. (Same reasoning as in #1, with Ax spades as another possibility).

In 1 and 2 I'd be very leery of a K/J/T hitting and him having a better 2 pair.

3) Fold. At worst opponent has OESD with a lower pair.

4) Call/Fold really seems like an OESD as a better hand (2 pair) would bet less as would 77. I feel like I'm slightly ahead here, but it's precarious. Considering I'dhave to fold to many cards on the turn/river, I'd change it to fold.

5) Fold. We could be drawing dead (trips) or near dead (need a Q). These aren't the types of pots I like to invest in. While our opponent may/should put us on a high PP this would seem to be the type of line that would cause us to get destacked against a set.