1、artificial
synthetic, fabricated, contrived, fake, mock, bogus, counterfeit, pseudo
2、conventional
traditional, historical, past; accepted, common, regular, routine, mainstream, ordinary
3、demand
request, claim, need, order, require, call for
4、decline
decrease, degeneration, drop, fall, recession, depression, reduction, slump, worsening
5、develop
evolve, advance, grow, improve, progress, flourish
6、difficulty
handicap, hardship, adversity, challenge, complication, dilemma, perplexity, plight, trouble
7、early
first, old, ancient, primitive, previous, former, remote
8、find
discover, come across, encounter, hit on, expose, notice, note, observe, recognize, spot, uncover
9f、uture
whats next, prospect, approaching, expected, destined, forthcoming
10、how
describe, operate, explain, clarify, demonstrate, eludicate, expound, illustrate, interpret, account for