It is exactly the way ________ we speak ________ makes our teacher angry.

 He was about to leave the office for home _______someone knocked the door and asked for some help.

_____ he had not been ill , Tom would have won the race.        

A British official said that_____ this impractical policy could be changed , the future for Britain was indeed dark.

________ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.