# 1Multiple ChoiceWhen I ___ (arrive) at the station, the train ___ (leave) already.arrived – was leavingwas arriving – leftarrived – had lefthad arrived – was leaving
# 2Multiple ChoiceWhile they ___ dinner, the lights suddenly ___.had – went outwere having – went outhad had – were going outwere having – were going out
# 3Multiple ChoiceI ___ (walk) home when I ___ (see) an old friend of mine.walked – sawwas walking – sawwalked – was seeingwas walking – was seeing
# 4Multiple ChoiceThe students ___ (discuss) the project when the teacher ___ (enter) the classroom.discussed – enteredwere discussing – enteredhad discussed – was enteringwere discussing – was entering