1.ThePullmanStrikeof1894tieduptransportationandwasfinallyendedonlybygovernmentintervention
(A)reliedupon(B)hindered(C)linkedwith
2.VoluntarismisatraditionintheUnitedStates.
(A)need(B)business(C)custom
3.Somespeciesofbacteriaandfungithriveonsimplecompoundssuchasalcohol.
(A)mixwith(B)dowellon(C)existin
4.FossilsarethetracesofplantsandanimalsofpastgeologicalagesthathavebeenpreservedintheEarth'scrust.
(A)registers(B)residues(C)profusion
5.Smokeparticlesandotherairpollutantsareoftentrappedintheatmosphere,thusformingsmog.
(A)caught(B)burned(C)dirtied
6.EuropeansestablishedpermanentcoloniesontheeasternshoresofwhatisnowtheUnitedStatesthroughouttheseventeenthcentury.
(A)during(B)before(C)upuntil
7.Althoughwildflowersappealtonaturelovers,someofthemareconsideredtroublesomeweedsbyfarmers.
(A)deadly(B)annoying(C)destructive
8.Ownersoflargeestatesgenerallykeeptheirpropertytidywiththehelpofkeepers.
(A)fertile(B)neat(C)inhabited