☆artificial
synthetic, fabricated, contrived, fake, mock, bogus, counterfeit,pseudo
☆conventional
traditional, historical, past; accepted, common, regular, routine,mainstream, ordinary
☆demand
request, claim, need, order, require, call for
☆decline
decrease, degeneration, drop, fall, recession, depression, reduction,slump, worsening
☆develop
evolve, advance, grow, improve, progress, flourish
☆difficulty
handicap, hardship, adversity, challenge, complication, dilemma,perplexity, plight, trouble
☆early
first, old, ancient, primitive, previous, former, remote
☆find
discover, come across, encounter, hit on, expose, notice, note, observe,recognize, spot, uncover...