Changing combination "ch"

The charming hen "c" enjoyed their day on the lake in a kayak. 

Now she chooses the mountain to check her new chauffeur. 

The chassis of our helicopter "h" will be a good sled.

But she is not used to the cold
 and catches the flu.

Now her sneezing  "achoo, achoo" 

will give her a push.

This video made by TOSMI shown as

sneezing chemistry can double your energy.

Team Sneezing TOSMI 2011 from TOSMI on Vimeo.

Finally you can see more information

about this shape sound

in PRONUNCIATION TIPS 

from BBC LEARNING ENGLISH

   sound ch    

These combinations of consonants that sound together
are    digraphs  
They are two successive letter that represent a single sound.