On the first hand, I rather like pass, although I'm sure there are days when I would bid 2♣ (it's hrothgar's favorite: mixed strategy). In any case I am doubling when 2♦ comes back to me.
I think we are getting at least 500 from 1♠X on the second hand, but I would still bid 4♥. The problem is that I suspect opponents have a big minor suit fit. They may well bid this minor suit when I pass 1♠X. Now we may not even get to play 4♥...
On the third hand I will bid 3♠, planning to pass 3NT from partner or raise a 4♦ rebid to 5♦. Auctions like these make me glad I don't play forcing notrump (so my 3♠ unambiguously shows two, without the need to jump around on a limit raise).

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