Annemarie Learns to Whistle

Five year-old Annemarie is excited because today she will find out the theme for the annual dance recital. Her excitement diminished when the dance teacher announces that this year's theme will be from The King and I: the calss must whistle and dance for their song. She tells them to whistle now. Annemarie tries but nothing happens. The girls near her notice this. What can she do?