mastery的形容词形式 -expert，
maintain-continue
moreover=in addition( 答案还有thus)
matter文中issue
mask = disguise MASKED 伪装的，隐藏的，潜伏的
merit
"milestone"---significant events ( in the context)
Milestone = significant events (select in whole paragraph, spend much time for this one)
Moreover-additionally
mean --- signify (还有一选项intend)
merit
masked
monopolize form --dominate
motif--pattern
monitored--observed
magnitude--extend
minutely adv.详细地, 精密地
minutely--finely
minute --tiny
minuscule--tiny
modification--alteration(另有clarification),
milestone--significant development
monotonous--boring

Note = record
nature--character
notwithstanding --despite
note--record 

outbreak = sudden increase（improved, upsetted, 另两个我忘了）
obscure=conceal 答案有干扰选项diminish
occasion-event
outlet 出口，出路
occasion-event
obscured- conceal
obtain --acquire