.He is good at English, ______we all know.
Mr. Smith is driving a car in the competition and I’m sure he will take the first place.
—Why are you so depressed? —I _____ my MP4 player on the bus.
Tired and disappointed, the rescue team finally reached _____ used to be a village.
Noise is unpleasant, _____ when you are trying to sleep.
So hard-working _____ that he sets a good example to all the other classmates.