concentrate – v. think carefully about a specific subject

bilingual – adj. using or able to speak two languages

self-esteem – n. confidence in yourself and a belief in your qualities and abilities

frustration – n. feeling of being annoyed because things are not happening in the way that you want

input – n. ideas or effort put into an activity or process in order to help it succeed

response – n. something that is done as a reaction to something else