Proper exposure demands that the proper amount of light be utilized. Shutter speed and lens opening are the camera parameters. Now, you would use a fairly fast shutter speed coupled with a wide lens opening. And, if a film camera, you would choose a fairly high speed film (High
ASA rating) to allow a fast shutter speed.
If you have no choice about the setting, make sure you have the flash on and put every setting on "automatic". Most cameras' circuitry can make those adjustments fastest.