【11)Thesubjectoftheselectures____bythelecturecommittee.A)isannouncedB)havebeenannouncedC)areannouncedD)hasbeenannounced12)Ifoundanaspirinbottle____droppedonthefloorofDavid'sroom.A)wasB)hadC)hadbeenD)is13)Thego】
11)Thesubjectoftheselectures____bythelecturecommittee.
A)isannounced
B)havebeenannounced
C)areannounced
D)hasbeenannounced
12)Ifoundanaspirinbottle____droppedonthefloorofDavid'sroom.
A)wasB)hadC)hadbeenD)is
13)Thegoods____whenwearrivedattheairport.
A)werejustunloading
B)werejustbeenunloading
C)hadjustunloaded
D)werejustbeingunloaded
14)Ifone____bypride,hewillrejectusefuladviceandfriendlyassistance.
A)overcomesB)isovercomeC)hasbeenovercomeD)overcome
15)Mostenvironmentproblemsexistbecauseadequatemeasuresforpreventingthem____takeninthepast.
A)wasnotB)werenotC)werenotbeingD)hadnotbeen
16)Yououghttohaveputthemilkintherefrigerator,now____sour.
A)IsmellB)itissmeltC)itsmellsD)itissmelling
17)Aftertherace____,thecelebrationbegan.
A)hadbeenwonB)iswonC)willbewonD)hasbeenwon
18)Hewashereforalittlewhile,butIdon'tknowswhereshe____now.
A)isB)wasC)hadbeenD)hasbeen
18)Theyoungteacherhas____competent.
A)beenprovedtobeB)provedtobeC)beenprovedD)provedbeing
19)Pluto,theoutermostplanetofthesolarsystem,____photographicallyinMarch1930.
A)discoveredB)wasdiscoveredC)bydiscoveryD)whendiscovered
20)Togetabetterviewofthestage,____.
A)ourseatshadtobechanged
B)ourseatswerechanged
C)wehadtochangeourseats
D)ourseatswerechangedbyus