题目内容
Some people regard a black cat as a_________of ill omen (不祥之兆).
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Listening to the music with earphones and the volume on really high can cause ________damage to your ears.
Writing these computer programs is extremely______ but fortunately we're all done now.
My grandma was a very kind woman who________her whole life to helping others.
Most teachers give written tests from time to time to help_______the progress of their students.
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