Speaking clearly. Improving voice and articulation: Фонетический практикум. Фомиченко Л.Г. - 10 стр.

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           mouth open.
     3. a) Breathe in and out through the nose with your li ps pressed.
        b) Pronounce the sound /m/, keeping the lips pressed together.
Relaxing Throat and Mouth
       Your throat and mouth passageways must be relatively open, se-
lectively relaxed, and free of unnecessary tension.
       Your li ps and the jaw, and your tongue must be agile and
flexible.
       1. «Freeze» or tense your throat and then swallow. Holding this
          extreme tension for a few seconds, say «ah».
       2. Say each italicized word with as much tension as possible. On
           the other words, be easy and open.
         a) Never eat the last cookie.
         b) Keep your eyes open and your mouth shut.
         c) Don’t go to sleep. Too many people die that way.
         d) Set a thief to catch a thief.
         e) Sometimes in the dark, you see what you want to see.
         f) If you believe everything you read, better not read.
     3. By the simple expediency of relaxing your jaw, you can rid
        your whole body of a lot of stress and tension. Keeping the
        feeling of ease and openness, say these words as though sighing.
           Who      now odd up          too
           How      moo oh       mush oat
           Awl      rue    sue call loll
           Coo      saw shawl lass sum
     4. Expa— a— a— a— and your vowels and di phthongs slightly
        as you read these with an open and relaxed throat. Concen-
        trate on producing cream — of — tomato soup sounds —
        smooth and rich.
       a) The day was like gold and sapphires.
       b) The river is a tide of moving waters.
       c) The lights were sown like flung stars.
       d) Come to us through the foilds of night.
       e) Darkness melted over the town like dew.
       f) Froth and foam trickled through the thawing mash.
       g) Love teaches even asses to dance.