51.（   ）

(单选题)The doctor is skilled at treating heart trouble and never ac (单选题)With the company making ______ profits, all the employees ar (单选题)—Thank you very much for the advice you gave me.— ______ (单选题)Companies expect young people to have ______ just academic q (单选题)______ in the crowd, he deliberately raised his voice and cl (单选题)—I hear Kris had an accident as he was riding his bike to sc (单选题)None of us can ______ why he did so. It is rather strange. (单选题)______ reality, it is not easy for young to find a job which (单选题)The word “unlucky” is written in the way of “un. lucky” main (单选题)What can we infer about the Pronunciation Key?