Check behind when pfrz'er checks on hu flop?

[JackAll]

If someone raises pf and you call in position and all else fold. What do you do when the pf rz'er checks these hu flops:


1. A72r and we have A3s
2. A67 2-tone and we have A3s (we have no draw but flop is drawy)
3. J83 and we have 22
4. J83 and we have 99
5. J83 and we have 89
6. QT3 and we have 56 (ie we have trash)


Oh, one more thing - for those we check, and with a villain that will often use a stop and go and bet the turn, are we calling a turn or river bet with any of these?