The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.

 It was in the lab ___was taken charge of by our teacher____ they did the experiment.

 Though ________ in San Francisco, Dave Mitchell had always preferred to record the plain facts of small-town life.

At the age of twenty Steve left his hometown, _____ to return without making his mark.

 Reportedly, yesterday a group of American soldiers were walking along the road in Iraq when a bomb was _______, three of whom were killed．

Seeing her father come back, ______________.

I feel it is you who ________ for the accident.

 I can’t remember ________ made the teacher give Mary the permission to leave the class earlier.

 In no time ________ smoke coming out of the house.

________ got on the train when it started to move.