to fall down; to drop; to be omitted; to be missing; to decrease; to sink; to fail (e.g. exam or class)
riddle; puzzle; enigma; enigmatic; mysterious
to appear on the market; to be in season (e.g. fruit); to circulate widely; to make the rounds; to go around
sure; certain; reliable; trustworthy; If I'm not mistaken; If I remember correctly
primary school; elementary school; grade school
origin; source; birthplace; release from prison; discharge from prison; exit
unclear; obscure; unknown; unidentified; ignorance; lack of wisdom
purpose; goal; aim; objective; intention
to wind; to coil; to envelope; to shroud; to outflank; to skirt
may; might; perhaps; may be; possibly
unidentified flying object; UFO
secret; private; surreptitious
landing; alighting; touch down
and the like; such as; or something; something like; I hear that ...; people say that...
invasion; incursion; raid; aggression; intrusion; trespass
unfounded (e.g. rumour); groundless; baseless; completely untrue
rumour; rumor; report; hearsay; gossip; common talk
together with; as X, then Y (e.g. as we age we gain wisdom, as wine matures it becomes more valuable, etc.)
to spread; to be propagated
appearing ...; looking ...; way to ...; method of ...ing; form; style
police; police officer; police station
amount necessary to fill a container (e.g. cupful, spoonful, etc.); drink (usu. alcoholic); full; one squid, octopus, crab, etc.; one boat; fully; to capacity
very; greatly; immense; enormous; serious; grave
be supposed or expected to (do); be sure to (do); ought to (do)
at that time; at that moment; then; on that occasion
to paste; to stick; to affix; to station; to post
to disappear; to vanish; to go out (of a fire, light, etc.); to die; to fade (of a feeling, impression, etc.); to vanish (e.g. of hope); to go away (e.g. of a smell, itchiness, sleepiness)
satisfaction; pride; one's strong point; one's forte; regular customer; regular client
censorship; inspection; examination
more than usual; especially; particularly
correspondence (to); equivalence; suitability; coordination; dealing with; coping with
dangerous; risky; awful; terrible; terrific; amazing
stock; products; stolen goods; loot; spoils
disagreeable; detestable; unpleasant; reluctant
to come out; to fall out; to fade; to discolour; to wear a hole (e.g. clothes); to leave (e.g. a meeting); to be clear
another time; again; over again; formally; especially; intentionally
ceiling; ceiling price; (price) ceiling
to look up at; to raise one's eyes; to look up to; to admire; to respect
large company; large enterprise; large corporation
to feel around for; to fumble for; to investigate; to probe into; to explore (parts unknown); to enjoy (natural beauty)