Hand 1

Only 4 hands on villain but he's 75/25. He took the betting lead away! Am I ever good on the river? Call or fold?

Full Tilt No-Limit Hold'em, $0.10 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

saw flop

Hero (Button) ($13.30)
SB ($9.60)
BB ($10.88)
UTG ($10.31)
MP ($27.01)
CO ($4.88)

Preflop: Hero is Button with A, 7
3 folds, Hero bets $0.30, 1 fold, BB calls $0.20

Flop: ($0.65) A, 7, 4 (2 players)
BB checks, Hero bets $0.40, BB calls $0.40

Turn: ($1.45) 9 (2 players)
BB bets $0.60, Hero raises to $2, BB calls $1.40

River: ($5.45) K (2 players)
BB bets $3.40, Hero ?

Hand 2

Only 4 hands on this villain too, he's 75/0. I think he's fishy.
I don't plan on c/f'ing the turn so I bet, and the river is a blocking bet. I think a fish could have worse hands even though the board is super scary.
I think I screwed this hand up but I'm not sure what to do different. How could I have played this hand better?

Full Tilt No-Limit Hold'em, $0.10 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

saw flop

BB ($13.40)
Hero (UTG) ($21.67)
MP ($4.25)
CO ($15.44)
Button ($2.97)
SB ($10.25)

Preflop: Hero is UTG with 10, A
Hero bets $0.30, MP calls $0.30, CO calls $0.30, 3 folds

Flop: ($1.05) A, K, 10 (3 players)
Hero bets $0.60, 1 fold, CO calls $0.60

Turn: ($2.25) Q (2 players)
Hero bets $1.40, CO calls $1.40

River: ($5.05) 4 (2 players)
Hero bets $2, CO calls $2