frontier (esp. the American frontier);  frontier (of a field);  forefront (of science, technology)
 at (place, time);  in;  to (direction, state);  toward;  for (purpose);  because of (reason);  for
 to lead;  to take the lead (in doing something);  to precede;  to go before;  to die before (esp. one's spouse, parents, etc.);  to be a prerequisite
 thing;  matter;  incident;  occurrence;  circumstances;  situation;  work
 indicates direct object of action;  indicates subject of causative expression;  indicates an area traversed;  indicates time (period) over which action takes place;  indicates point of departure or separation of action;  indicates object of desire, like, hate, etc.
 a few years ago;  some years back
 to begin a trip;  to depart;  to embark;  to die;  to pass away;  to depart this life
 20 years old; (arch.)  twenty
 number one;  first;  best;  most;  game;  round
 counter for people (usu. seating, reservations and such);  first name;  famous;  great;  name;  noun
 indicates possessive;  nominalizes verbs and adjectives;  substitutes for "ga" in subordinate phrases;  (at sentence-end, falling tone) indicates a confident conclusion;  (at sentence-end) indicates emotional emphasis;  (at sentence-end, rising tone) indicates question
 emigration;  immigration;  emigrant;  immigrant
 fleet (fishing, naval, etc.);  convoy;  group of ships
 large company;  large enterprise;  large corporation
 indicates sentence topic;  indicates contrast with another option (stated or unstated);  adds emphasis
 planning;  project;  plan;  design
 planning;  devising (a plan);  drafting;  drawing up
 advanced;  developed;  seniority;  senior;  superior
 technology;  engineering;  technique;  skill;  art;  craft
 throwing in;  inserting;  investment;  commitment (of funds, personnel, etc.);  launching (a product into the market);  introduction
 large;  big;  great;  prominent;  -sized;  as big as;  university
 (sea) voyage;  navigation;  sailing;  passage;  cruise
 space (between);  gap;  period of time (during, while);  duration;  between (two parties or things);  among (a group);  relations (between)
 also;  too;  not ... either;  (it's not possible) no matter what;  although one might wish otherwise
 development;  growth;  development (of a situation, story, etc.);  advancement;  playing around;  having an active sex life
 to continue;  to keep up;  to keep on
 such things as ...;  and ... and;  the minute (that) ...;  no sooner than ...;  be;  is;  o
 et cetera;  etc.;  or something;  the likes of;  for example;  for instance
 kind;  sort;  type;  similar example;  parallel;  the like
 to see;  to look;  to examine;  to look over;  to look after;  to attend to;  to experience
 altitude;  height;  elevation;  high-degree;  high-grade;  advanced
 to hold (in one's hand);  to take;  to possess;  to have;  to maintain;  to keep;  to last
 but;  however;  (and) yet;  nevertheless;  still;  for all that
 that;  the;  part (as in "part two");  um ...;  er ...
 attack;  assault;  raid;  criticism;  censure;  denunciation
 in front (of);  before (e.g. a building);  before;  earlier;  (the) front;  frontal part;  forward
 to;  for;  in order to;  for;  as for;  regarding
 order;  command;  decree;  (software) instruction;  statement
 damn;  damn it;  feces;  excrement;  damn;  damned;  very
 insect;  bug;  worm;  roundworm;  one's emotions;  one's feelings;  nervousness