my in-laws are watching Billy Elliot, I can play poker again

[gnads]

I'm a bit rusty after a few weeks off over christmas so any comments on any street are appreciated.

HAND 1 - My first orbit at the table. I was trying to pick up the dead money PF really but I'm not sure about my turn line. Maybe bet $7-8 instead or C/R AI?

PokerStars No-Limit Hold'em, $0.25 BB (5 handed)
UTG ($31.65)
MP ($27.85)
Button ($27.30)
Hero ($24.75)
BB ($55.50)

Preflop: Hero is SB with K, A.
1 fold, MP calls $0.25, Button calls $0.25, Hero raises to $2, BB calls $1.75, MP folds, Button folds.

Flop: ($4.50) 9, T, K (2 players)
Hero bets $3, BB calls $3.

Turn: ($10.50) 2 (2 players)
Hero bets $5, BB raises to $20.75, Hero calls $14.75 (All-In).

River: ($51) T (2 players, 1 all-in)

Final Pot: $51


HAND 2 - Villain is 63/16/1.8 over 80 hands or so. Fold the river?

PokerStars No-Limit Hold'em, $0.25 BB (4 handed)

Hero ($27.80)
Button ($25.35)
SB ($33.10)
BB ($21.10)

Preflop: Hero is UTG with A, T.
Hero raises to $1, 1 fold, SB calls $0.90, 1 fold.

Flop: ($2.25) T, 5, 4 (2 players)
SB checks, Hero bets $1.5, SB calls $1.50.

Turn: ($5.25) 9 (2 players)
SB checks, Hero checks.

River: ($5.25) 3 (2 players)
SB bets $3, Hero calls $3.

Final Pot: $11.25


HAND 3 - Villain is 30/17/1.8 over 500+ hands and seems to play straightforward OOP so I gave this a shot

PokerStars No-Limit Hold'em, $0.25 BB (5 handed)

Hero ($24.40)
SB ($21.20)
BB ($48.05)
UTG ($87.85)
MP ($27.60)

Preflop: Hero is Button with 8, 8.
1 fold, MP raises to $1.25, Hero calls $1.25, 2 folds.

Flop: ($2.85) A, 3, 9 (2 players)
MP checks, Hero checks.

Turn: ($2.85) 6 (2 players)
MP bets $2, Hero calls $2.

River: ($6.85) T (2 players)
MP checks, Hero bets $5

[UG]

1) fine,EDIT: but sometimes I might fold this turn b/c I know nothing about my opponent
2) fine
3) anything that calls you beats you...probably 99-KK here, check behind normally.