1a Alphabet soup
1b Seeing eye to eye
1c Help is on the way
1d Total recall

2a Mid-Life crisis
2b Standing room only
2c Once bitten, twice shy
2d Odd-man out

3a Borderline insanity (or any variation thereof)
3b Top of the heap
3c Lay it on the line
3d Look both ways before crossing

4a Can't see the forest for the trees
4b Stir crazy
4c Joined in holy matrimony
4d Drawn and quartered