The /k/ sound at the beginning of words can be spelled with a c or a k. This is one of the consonants that can vary.
K takes i and e, and C takes the other three.
Some words with short vowels can begin with the /k/ sound.
Some words with more advanced vowel patterns can begin with the /k/ sound.
Introduce these words as the patterns are learned.
Available at the Super Tutor Tools store at Teachers Pay Teachers: A worksheet for the sound of /k/ at the beginning of words with anchor charts and word lists. Or the free anchor charts and word lists. A worksheet and game board are included in the Phonics Pow Toolkit. (IV.c) Learn how to get the free word sort games that include the /k/ sound.