Hand 1 - Villain is 34/18/1.4 over 143 hands. What to do on the turn?

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($25)
MP ($25.20)
CO ($25.50)
Button ($13.65)
Hero ($27.65)
BB ($11.60)

Preflop: Hero is SB with K, K.
2 folds, CO raises to $1, 1 fold, Hero raises to $3, 1 fold, CO calls $2.

Flop: ($6.25) T, 5, 6 (2 players)
Hero bets $4.75, CO calls $4.75.

Turn: ($15.75) A (2 players)
Hero ??

Hand 2 - Bleh, just call/push/fold the flop? If I'm just calling what do I do if the other player calls or pushes?

UTG is 65/5/0.25 over 20 hands and button is 21/12/0.78 over 47 hands, so both fairly small samples. Read into the figures if you wish

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($53.85)
UTG ($13)
Hero ($49.90)
Button ($55.25)
SB ($91.65)

Preflop: Hero is MP with Q, A.
UTG calls $0.25, Hero raises to $1.25, Button calls $1.25, 2 folds, UTG calls $1.

Flop: ($4.10) 5, 6, 8 (3 players)
UTG bets $11.75 (All-In), Hero??

Hand 3 - 44/11/1.5 over 5 hands

Whats my turn play?

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($6.50)
Button ($7.80)
SB ($20.20)
Hero ($24.95)
UTG ($27.20)
MP ($15.60)

Preflop: Hero is BB with 8, 6.
UTG calls $0.25, MP calls $0.25, 2 folds, SB completes, Hero checks.

Flop: ($1) 4, 7, Q (4 players)
SB checks, Hero bets $0.75, UTG calls $0.75, MP calls $0.75, SB calls $0.75.

Turn: ($4) 8 (4 players)
SB checks, Hero bets $2.5, UTG raises to $5, MP folds, SB folds, Hero??