名词解释：offer
Thecolloquialorspokenlanguageisthelanguagefortheuseofthe________.
Imaginehowmanytimesrestaurantsandmerchantshadtochangetheirpostedpricesduringthe_____1970s,whenpricesalmostdoubled.
Therearemanysalesthisseason,duringwhichstoreswilllowertheir_______prices.
TheFrenchmaintaina________separationofpersonalandprofessionallife.
