Yo siempre digo la verdad.
You can use any form of the verb, but it has to be indicative. I have used the <u>present form</u> (the most used in these cases) of the verb "decir" (say).
Answer:
Digo.
Explanation:
hace mucho calor
espero que esto te haya ayudado
hope this helped
No quema cuh is the correct answer.