classroom; lecture room; department (in a university); class; lessons; school (for a particular discipline)
to jump in; to leap in; to plunge into; to burst in; to barge in
(teacher's) platform; podium; dais
invisibly; secretly; privately
to hold one's breath; to bate one's breath
to wait and see; to see how the land lies
as expected; as predicted
noisy; loud; boisterous; turbulent; unsettled; restless
to make noise; to make racket; to rustle; to swoosh; to make merry; to clamor; to clamour
to run through (a crowd, gate, etc.); to sweep through (e.g. of news through a city); to run past (someone) from behind; to overtake
all of a sudden; suddenly; by chance; unexpectedly
to run; to run (of a vehicle); to drive; to rush (to); to dash; to retreat; to flee
good policy; wise policy; best plan
bustling; busy; crowded; lively (party, voices, etc.); loud; noisy
every person; every mouth; every entrance
to say to each other; to exchange (jokes, comments, etc.); to quarrel; to dispute
excitement; stimulation; agitation; arousal
silence; stillness; quietness
to let leak; to let out (e.g. light); to let out (a secret); to leak (information); to give utterance to (e.g. one's dissatisfaction); to vent; to wet one's pants
(in the) neighbourhood; neighborhood; around; about; for instance; say
considerably; greatly; a lot
dark; gloomy; depressed; dispirited; dark (in colour); dull; ill-boding
storehouse; warehouse; godown
temporary; transitory; short-lived
to put in order; to tidy up; to settle (a matter); to solve; to finish; to get through
to take in; to gather in; to adopt (e.g. an idea); to accept (e.g. advice); to harvest; to reap
night watch; night guard; night shift
when it comes to ...; if one were to speak of ...; by ... you mean ...; when you say ... you mean that ...; whenever ...; if it's ... then (without fail)
surveillance camera; security camera
strict; severe; stringent; rigorous; rigid; firm
vigilance; caution; alertness; precaution; being on guard
exaggerated; overdone; overblown; hyperbolic; bombastic; grandiose
opening (a door, window, etc.); leaving open; opening up (e.g. to the public); allowing (public) access
utensil; implement; tool; instrument; appliance; apparatus
to install; to fit; to (manage to) obtain (someone's agreement, permission, etc.); to get; to patronize (a shop); to buy usually (from the same store)
staff member; employee; worker; personnel
set (of things); combo; setting up; preparing; setting (hair); set (in tennis, volleyball, etc.); set (in a play, film, etc.)
gap; opening; break; interval; unguarded moment; carelessness
full of (e.g. mistakes); riddled with; covered all over with (blood, mud, etc.)
prefab; prefabrication; prefabricated building