语音：请选出每组中下划线字母发音不同的单词（共5小题；每小题1分，满分5分）。
I went to the Lincoln Memorial yesterday, _____, not surprisingly, was crowded with visitors from all over the world.
We are not ready to go into production yet. The new machine isn’t fully _____.
—Do you know where David is? — Well, he _____ have gone far — his coat is still here.
He is my favorite film star. I regard him _____ other stars.
He would have been a doctor 20 years ago, but he _____ to be a teacher.
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