JULIE : I want to be the ambassador of Korea.
EXPLANATION : This is correct! ☺

JULIE : Old workers mostly retired.
CORRECT : Old workers mostly retire.
EXPLANATION : The tense of the verb shouldn't be in the past because this is in the present continuous.

JULIE :  I wnat to feel the work ethic.
CORRECT : I want to feel the work ethic.
EXPLANATION : Be careful with your spelling.

JULIE : My little sister was endeared
CORRECT : My little sister was endeared by all.
EXPLANATION : I added 'by all' to give the sentence a complete thought.

JULIE : I am not selfless today.
EXPLANATION : This is correct! ☺

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Hi Julie! You did great with your homework today. You were able to use the words/expressions correctly in a sentence. And, you only had few grammar lapses today. Good job Julie! Keep it up.
~Teacher Louise