a couple hands

[yourface]

Party Poker 0.50/1 Hold'em (10 handed)

opponents are your standard party .5/1 fare.

Hand 1:
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Preflop: Hero is MP1 with J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.50.
3 folds, Hero raises, 4 folds, SB =#A500AF(villan)/ 3-bets, 1 fold, Hero calls.

Flop: (8 SB) 7[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img] (2 players)
villan bets, Hero raises, villan calls.

Turn: (6 BB) T[img]/images/graemlins/spade.gif[/img](2 players)
villan checks, Hero bets, villan raises, Hero calls.

River: (10 BB) 7[img]/images/graemlins/heart.gif[/img] (2 players)
villan bets, Hero calls.

Final Pot: 12 BB

Should I have raised the river?

Hand 2:
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Preflop: Hero is UTG+2 with K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img]. MP3 posts a blind of $0.75. CO posts a blind of $0.50.
1 fold, UTG+1 calls, Hero calls, 3 folds, CO (poster) checks, Button calls, 1 fold, BB =#A500AF(villan)/ checks.

Raise this right?

Flop: (7 SB) K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img] (5 players)
villan checks, UTG+1 checks, Hero bets, CO folds, Button calls, villan calls, UTG+1 calls.

Turn: (5.50 BB) 6[img]/images/graemlins/club.gif[/img] (4 players)
villan bets, UTG+1 folds, Hero calls, Button folds.

I never know whether to call or raise in this position. I've been having a bad week which I'm sure influenced my decision.

River: (7.50 BB) T[img]/images/graemlins/heart.gif[/img] (2 players)
villan bets, Hero calls.

Final Pot: 9.50 BB

Hand 3:
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Preflop: Hero is Button with Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
3 folds, MP1 calls, MP2 raises, 2 folds, Hero calls, SB calls, BB calls, MP1 calls.

3-bet this?

Flop: (10 SB) A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img] (5 players)
SB checks, BB bets, MP1 calls, MP2 folds, Hero raises, SB folds, BB calls, MP1 calls.

Turn: (8 BB) 6[img]/images/graemlins/club.gif[/img] (3 players)
BB bets, MP1 calls, Hero calls.

Same issue as hand 2.

River: (11 BB) 3[img]/images/graemlins/club.gif[/img] (3 players)
BB bets, MP1 calls, Hero calls.

Final Pot: 14 BB

Advice on all streets would be appreciated.