Professor Smith, many students want to see you. __________ they wait here or outside?
He was busy writing a story,only _________ once in a while to smoke a cigarette.
_________ the project as planned,we’ll have to work two more hours a day.
. We finished the run in less than half the time _________.
The trees _________ in the storm have been moved Off the road.
—Can those _________ at the back of the classroom hear me? —No problem.