concentrate|verb|to direct all thoughts or efforts toward one thing, (&ldquo;He concentrated on his homework.&rdquo;); to come or be together (&ldquo;The factories are concentrated along the river.&rdquo;)
simple|adjective|easy to understand or do; not difficult or complex
slow|adjective|not fast in moving, talking or other activities
slow|adjective|not fast in moving, talking or other activities
surround|verb|to form a circle around; to be in positions all around someone or something
thing|noun|any object; any idea, feeling, action or fact that you can think of as one item (&ldquo;The important thing is to be honest.&rdquo;)

