Thisisanimportantproblem_______toofewsocialscientistshaveresearched.

is,are,was,were,itself,himself,themselvesThetradeunion________believedtoregard________asanorganizationwherethemolestedcouldseekadviceandhelp.

AftertheAmericanCivilWar,theliteraryinterestintheso-called“reality”oflifestartedanewperiodintheAmericanliterarywritingsknowantheAgeof().

“Apple,pear,peach,orange,lemon,etc.”makeupthe______of“fruit”.

______movesonascaleofthenationallanguage,dialects,andindividualwaysofcommunication.