[?], such as good grades or higher pay or position within a company, may be limited.
[?] are especially suitable for English language learning.
[?] can also use English language learning apps and tools to practice [?], vocabulary, and speaking and [?].
Speech disorders, or too many [?], or computer-generated voice for listening practice can be distractors when learning English.
People moving to other countries usually do not [?] the local language and have to learn it by cultural immersion and hard study.