A wormhole would slide into a black hole. Because a black hole is a warp in spacetime like a V, and a wormhole is also a warp in spacetime represented as ) (, both viewed from a higher dimensional point of view, seeing 3d spacetime as a flat plane at top of the text rows. Hmm while visualizing it, maybe the black holes' pit, somewhat like a wormhole entrance with no exit, would in fact fall into the WORMOLE instead, bobbing up and down between the upper and lower funnels of a wormhole, wherever they may be (lets hope not your laboratory!), until it settles in the "center", and is now a blackhole V whose mouth opens up in each side- like a rotated ><.. hmm interesting. So, possibly a Black hole and wormhole combo results in the same black hole Evento Horizon residing in two physical places/times. anyway, next question.
I believe that if indeed a wormhole was stable and opened near a black hole, the black hole would indeed pull at things on the far side.. and in return, that black hole is getting pulled toward the wormhole enterance (so turn it off QUICK!!). "Pulled" is not really the right term... More like "sliding" together on the sloped/warped ramp of spacetime.. which oddly enough, is what gravity actually IS.
A supercollider does not have to be a circle... but whole point of the circle is to use the accelerator magnets over and over again to get a longer repeated acceleration path. So making a straight collider that performs the same as a circular one where the particles are acclerated of thousands of cycles around that circle, the straight one would have to reach the moon to have enough magnetic accelerators to compete with the circulars' performance.
so in the end, like that poem says "Beware looking into the Darkeness, for when you stare deep into it, it is also staring deeply back at YOU"- or more relavently: "dont bring a wormhole to a Black Hole, because you are in effect bringing the Black Hole back to YOUR FACE"
:)