What is the yo form of the verb decir in the present tense?

Will give brainliest to who ever answers right first select the word from the list that best fits the definition to prepare: cantar escuchar prestar atención enseñar preparar

(i put) la carta dentro de uno de estos.

Mary just sent out invitations to her wedding last week the invitations were so heavy that she put more than just one stamp on each envelope she used 255 stamps and mailed out 85 invitations and see you as an equal amount of stamps on each envelope