conventional 

traditional, historical, past; accepted, common, regular, routine, mainstream, ordinary

early 

first, old, ancient, primitive, previous, former, remote

simulate 

virtual, create, reproduce, pretend, imitate

artificial 

synthetic, fabricated, contrived, fake, mock, bogus, counterfeit, pseudo

reduce

curtail, cut, decrease, halve, impair, lessen, moderate, trim, slash

future 

what's next, prospect, approaching, expected, destined, forthcoming

worldwide

international, cosmopolitan, global, universal, ubiquitous, widespread, around the world

develop 

evolve, advance, grow, improve, progress, flourish

find

discover, come across, encounter, hit on, expose, notice, note, observe, recognize, spot, uncover

demand

request, claim, need, order, require, call for

decline 

decrease, degeneration, drop, fall, recession, depression, reduction, slump, worsening

significance

importance, milestone, impact, justification, gist, implication, point, purport, vital

prevelant

common, usual, prevailing, widespread, systematic, collective, general, popular

objection

chanllenge, complaint, disapproval, opposition, protest, query, question, remonstration

obstacle 

bar, barricade, barrier, block, blockage, check, obstruction, problem, snag, hurdle

commercial

business, economic, financial, mercantile, profitable, pecuniary

inevitable

unavoidable, certain, destined, fated, inescapable, sure

millitary

armed, belligerent, army, weapon, warlike

role

function (provide, support, weaken, smooth, solve), job, position, duty, post, task, contribution 

recent 

modern, current, now, nowadays, today, contemporaneous, new, novel, present, up-to-date

difficulty 

handicap, hardship, adversity, challenge, complication, dilemma, perplexity, plight, trouble

how

describe, operate, explain, clarify, demonstrate, eludicate, expound, illustrate, interpret, account for