1.Nobodynoticedthethiefslipintothehousebecausethelightshappenedto___
A.beputupB.givein
C.beturnedonD.goout
2.Thenewbridge__bytheendoflastmonth
A.hasbeendesignedB.hadbeendesigned
C.wasdesignedD.wouldbedesigned
3.Whenpartofapencilisinaglassofwater,itlooksasifit__
A.breaksB.hasbroken
C.wasbrokenD.hadbeenbroken