-to stay out the way
-to close tightly and let the rest of the mouth do the moving
-to open as much as possible
The first and third answers got equal support. The correct answer is to OPEN AS MUCH AS POSSIBLE. Although it is many times paid no attention to, the jaw is actually considered one of our articulators (as are the teeth, lips and tongue). The position of the jaw truly affects the amount of space there is for air flow as well as the placement of correct pitch and quality.
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