to support (a theory, claim, etc.); to back up; to substantiate; to prove
to choose; to select; to pick (out)
monitoring; watching; observation; surveillance; guarding; supervision
to use completely; to use up; to exhaust; to exhaust someone's civility; to give up (on someone)
riddle; puzzle; enigma; enigmatic; mysterious
one theory; one opinion; another theory
by means of; due to; because of; according to
material; materials; data; information; documents
secrecy; highly classified information
control; management (e.g. of a business)
in truth; in actuality; at heart; the truth; the real story
simple; plain; uncomplicated; straightforward; simple-minded; naive
to join hands together; to join forces; to collaborate
to spill; to fall out of; to peek through; to become visible (although normally not); to escape (of a smile, tear, etc.)
derisory; negligible; minimal; nominal; imperceptible
oral instruction; passing information by word-of-mouth; oral tradition
important; significant; precious; valuable; careful
protection; safeguard; guardianship; preservation; conservation
trump; trump card; ace up one's sleeve; secret weapon
expression; representation; description; representation (of a group)
very; extremely; terrible; horrid; remarkable; extraordinary
occasion; time; circumstances; (in) case (of); when
condition; term; requirement; qualification; prerequisite
demand; firm request; requisition; requirement; desire
too (much); overly; excessively
to forget completely; to leave behind
the past; bygone days; one's past (that one would prefer remained secret); past (tense); preterit; previous life
treatment; service; handling (of a machine, tool, etc.); operation; treating as; treating like
fair attack; fair tactics; straightforward approach; standard procedure; established method
to match; to be a match for; to rival; to equal; to compare with
the more ... the more ...; as; (arch.) while; (arch.) during; (arch.) because; (arch.) since
to part (usu. of people); to part from; to separate (of a couple); to break up; to lose (e.g. one's mother); to be bereaved
classroom; lecture room; department (in a university); class; lessons; school (for a particular discipline)
to aim at (for, to do, to become); to try for; to have an eye on; to go toward; to head for
set of three; three sets; three classes