Hard to tell if I'm losing value by folding. Thoughts on the following?

Hand 1) I think I'm never ahead here.

Full Tilt No-Limit Hold'em, $0.25 BB (9 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($17.60)
SB ($4.65)
BB ($20.40)
UTG ($42.40)
UTG+1 ($11.65)
MP1 ($17)
Hero ($24.65)
MP3 ($25)
CO ($25)

Preflop: Hero is MP2 with J, A.
1 fold, UTG+1 calls $0.25, 1 fold, Hero raises to $1.25, CO calls $1, 3 folds, UTG+1 calls $1.

Flop: ($3.85) 4, A, 6 (4 players)
UTG+1 bets $2.8, Hero calls $2.80, CO folds.

Turn: ($9.45) 9 (3 players)
UTG+1 bets $7.6 (All-In), Hero folds.

Final Pot: $1.85

Hand 2) Check-fold or bet this turn?
Full Tilt No-Limit Hold'em, $0.25 BB (9 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

UTG+1 ($26.30)
MP1 ($14.80)
MP2 ($38.40)
MP3 ($31.45)
CO ($21.10)
Button ($4.65)
Hero ($23.35)
BB ($32.75)
UTG ($25)

Preflop: Hero is SB with , .
2 folds, MP2 calls $0.25, MP3 calls $0.25, 2 folds, Hero raises to $1.35, 2 folds, MP3 calls $1.

Flop: ($3.10) , , (3 players)
Hero bets $2.5, MP3 calls $2.50.

Turn: ($8.10) (3 players)
Hero checks, MP3 bets $3, Hero folds.

hand 3) All bad?
Full Tilt No-Limit Hold'em, $0.25 BB (9 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

Button ($10.95)
SB ($9.25)
BB ($4.90)
UTG ($9.25)
UTG+1 ($10.55)
MP1 ($5.90)
MP2 ($5)
Hero ($19.80)
CO ($31)

Preflop: Hero is MP3 with , .
3 folds, Hero raises to $0.85, CO calls $0.85, 1 fold, SB calls $0.75, 1 fold.

Flop: ($2.80) , , (4 players)
SB checks, Hero bets $2.5, CO calls $2.50, SB folds.

Turn: ($7.80) (3 players)
Hero checks, CO bets $2, Hero folds.

Final Pot: $7.80

Final Pot: $8.10