is that so? (generally rhetorical)
 what;  you-know-what;  that thing;  whatsit;  whachamacallit;  (not) at all;  (not) in the slightest
 yes;  indeed;  ha!;  what?;  huh?;  sigh
 medium;  average;  moderation;  middle school;  China;  volume two (of three);  during (a certain time when one did or is doing something)
 at (place, time);  in;  to (direction, state);  toward;  for (purpose);  because of (reason);  for
 abrupt;  sudden;  unexpected
 friend and foe;  enemies and allies;  both sides
 relation;  relationship;  participation;  involvement;  influence;  effect
 attack;  assault;  raid;  criticism;  censure;  denunciation
 to start;  to begin;  to challenge;  to pick (a fight);  to set (traps);  to plant (explosives)
 position;  location;  base;  point;  site
 occupying;  having (an area) all to oneself;  military occupation;  possession;  capture
 to do;  to carry out;  to cause to become;  to make (into);  to serve as;  to act as;  to wear (clothes, a facial expression, etc.)
 to leave;  to go away;  to pass;  to elapse;  to be distant;  to send away;  to drive off
 riddle;  puzzle;  enigma;  enigmatic;  mysterious
 pluralizing suffix (esp. for people and animals; formerly honorific)
 pupil;  student;  schoolchild
 space (between);  gap;  period of time (during, while);  duration;  between (two parties or things);  among (a group);  relations (between)
 at;  in;  at;  when;  by;  with;  and then
 to call out (to);  to call;  to summon (a doctor, etc.);  to invite;  to designate;  to name;  to garner (support, etc.)
 still;  as yet;  (not) yet;  more;  (more) still;  at least
 encounter;  being confronted with (e.g. difficulty);  meeting with (e.g. accident)
 thing;  matter;  incident;  occurrence;  circumstances;  situation;  work
 nonexistent;  not being (there);  unowned;  not had;  unique;  not;  impossible
 right?;  isn't it?;  hey;  say;  you know;  you see;  will you?
 such;  that sort of;  that kind of;  no way!;  never!
 fellow;  guy;  thing;  object;  he;  she
 to be (of animate objects);  to exist;  to stay;  to be ...-ing;  to have been ...-ing
 sentence-ending particle expressing doubt
 to see;  to look;  to examine;  to look over;  to look after;  to attend to;  to experience
 always;  without exception;  necessarily;  certainly;  without fail;  positively
 chest;  breast;  breasts;  bosom;  heart;  lungs;  stomach
 destruction;  disruption;  (application) crash
 to make noise;  to make racket;  to rustle;  to swoosh;  to make merry;  to clamor;  to clamour
 homeroom;  form room;  form class
 time;  hour;  period;  class
 teacher;  instructor;  sensei;  title or form of address for a teacher, master, doctor, lawyer, etc.;  intimate or teasing form of address; (arch.)  one's elder
 concerning;  regarding;  per (e.g. 100 yen per person);  for every
 information;  news;  intelligence;  information;  data contained in characters, signals, code, etc.
 collecting;  accumulating;  collection (of art, stamps, insects, etc.);  garbage collection;  waste collection