often; again and again; over and over again; repeatedly; frequently
doubt; question; suspicion; dubiousness
to pile up; to stack up; to accumulate
thesis; essay; treatise; paper; article
to switch (secretly); to substitute; to replace; to sidestep (an issue)
in succession; in an endless stream; continuing without pause or interruption
to backfire; to have a harmful result
urgent; pressing; immediate; urgently; promptly; at once
appeal; call for something; request; axiom
refusal; rejection; denial; veto
I'm sorry; my apologies; may I come in?; permission; leave; dismissal
to lose one's temper; to lose patience; to have enough; to be exasperated; to become irritated; to get fed up
tough measure; firm step; strong measure
often; frequently; now and then; occasionally
event; affair; incident; case; plot; trouble
restlessly; aimlessly; to loiter; to drift; to be restless; to fuss
victim (esp. someone killed); casualty
to finger; to play with; to make changes to; to tinker with; to dabble in; to do as a hobby
guinea pig (Cavia porcellus); subject of an experiment; (human) guinea pig
passage (of time); elapsing; progress; development; transit
mind; spirit; attitude; mentality; spirit (of a matter); essence
cripple; disabled person; invalid; (game, internet, etc.) addict
success; achievement; succeeding (in life); (worldly) success; prosperity
collection; recovery; withdrawal; retrieval
even more; still more; further
experiment; experimentation
to manufacture; to produce; to raise (crops); to invent; to dream up; to create
regarding ...; concerning ...; about ...; on ...; with respect to ...; in regard to ...
dot; spot; mark (in an exam, etc.); grade; point (in a game); score; point
to have an eye on; to zero in on
negligence; carelessness; inattention; unpreparedness
free; unrestricted; (with) complete mastery; completely in control
technology; engineering; technique; skill; art; craft
establishment; settlement
foreign country; another country; another province; strange land; alien land
several years; a few years
disclosure; exposure; revelation
scrap (metal); clipping (from a newspaper, magazine, etc.); cutting; scrapbook
to cause; to induce; to bring about; to pull upright; to help up (e.g. a fallen person)