We were told not to touch the equipment in the laboratory unless ________.
That hero who died in the war was so brave that he never _____ to the enemies until death.
The reason _____he was absent was _____ he was ill and unable to go to school.
Mr. Brown is _____ a teacher to us; we look on him as our friend.
He commanded that the students ______the classroom before he returned.
The girl _____ leg was broken in the earthquake was taken to the hospital.