他向同事们挥手道别。
He waved ___farewell to his colleagues.
她含着泪向我们挥手道别。
She waved to us with tears in her eyes as a ___farewell.
毕业典礼以师生合唱的告别歌曲结束。
The graduation ceremony concluded with a heartfelt ___farewell song by teachers and students.
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