pls help me fill in the conjunction ?!?ASAP pls?!!

I opened the door just a crack, __________ the dog got out.

but
nor
and
neither
either
or


___________ their troops would pull back, or our forces would attack.

neither
nor
or
either
and
but

The fireworks _____ music were a terrific combination.

but
and
or
either
neither
nor


You can read __________________ nap, whichever you prefer.

or
but
nor
either
and
neither

I would have gone, __________________ I was sick.

or
but
neither
and
either
nor