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;)
regret|verb|to feel sad or sorry about something you have done or wished you had done
regret|noun|a feeling of sadness about something that you did or that you did not do and wished you had done
stay|verb|to continue to be where one is; to remain; to not leave; to live for a time (&ldquo;They stayed in New York for two years.&rdquo;)
test|noun|a group of questions or problems used to find out a person&rsquo;s knowledge (&ldquo;The students did well on the language test.&rdquo;); medical investigation of a part of someone&rsquo;s body; process of trying something to see if it works correctly
test|noun|a group of questions or problems used to find out a person&rsquo;s knowledge (&ldquo;The students did well on the language test.&rdquo;); medical investigation of a part of someone&rsquo;s body; process of trying something to see if it works correctly
weak|adjective|having little power; easily broken, damaged or destroyed; opposite strong
