Unless _________ by the police, you should keep silent over the accident.

_________ in the mountain for more than 2 days, the climbers looked pale and weak.

Buses here are always crowded with passengers, so I prefer _____ there rather than take a bus.

I never put anything _____ others into my bag.

Mr. Andrew taught his students how to develop the basic skills in the physics class, ______ everything through jokes and experiments.

_______behind a tall tree, the little girl was not noticed by anybody at all.

From his ______ look, we could see that he hadn’t expected that we could raise such ______questions to him.

The money collected should be made good use _____ the people who suffered great losses in the earthquake.