List and explain three exercises that will improve vocal control

What will be an ideal response?

(1) To improve breath control, you can say the entire alphabet, using only one breath. As you practice, say the letters slowly so that when you exhale the breath becomes slow and more controlled. In other words, exhalation should take twice or three times as long as the inhalation.
(2) To improve the control of pitch, sing "low, low, low, low," dropping one note of the musical scale each time you sing the word until you reach the lowest tone that you can produce. Then sing your way back up the scale. This time you are singing "high, high, high, high," going up the musical scale to the highest note that you can reach. Alternate singing low and high until you find the notes that you're most comfortable. This is called optimal pitch. When you give your speeches, you should give them at your optimal pitch.
(3) To control articulation, pronounce each of the following word groups, making sure that each word can be distinguished from the others. Have someone check your accuracy: jest, gist, just; thin, think, thing; roost, roosts, ghost, ghosts; begin, began, begun; wish, which, witch; affect, effect; twin, twain, twine. Or you can try tongue twisters.