Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. When obstacles arise, it is essential that a language learner put his bes
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Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of thefollowing questions.
When obstacles arise, it is essential that a language learner put his best ________ forward toachieve desirable results.