if something is certain to happen and impossible to avoid, it`s in...............................
inevitable
the fact of being completely involved in something you are doing = i...........................
immersion (in sth)
increasing in amount or value gradually and by a regular amount, usually small = i...........................
incremental
to succeed in getting something, especially something difficult to get = s.................
snag
to move very quickly and with a lot of energy, to jump = l........................
leap