Howlong________they________(dig)theditch?
Wooddoesnotconductelectricity;________.
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
________(fail)severaltimes,theyneedsomeencouragement.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Thistest________anumberofmultiplechoicequestions.