A number of tests have been conducted to _________ that these drugs have no side effects.
A.find out | B.look for | C.make sure | D.work out |
Mostofhistime _____inreadingnovels.
A.arespent | B.isspent | C.werespent | D.wasspending |
Mostofthemistakes____becauseofcarelessness.
A.weremade | B.aremade | C.hasbeenmade | D.weremaking |
Theboysittingbythewindowistheonlyoneofthestudentswho _______fromthecountrysideinourschool.
A.are | B.is | C.were | D.was |
Thestudentsinourschooleach_________anEnglishdictionary.
A.have | B.has | C.had | D.arehaving |
Thepairofshoes__________wornout.
A.was | B.were | C.havebeen | D.hadbeen |