单词辨音 (共10小题，每题0.5分，满分5分)
There __________ great changes in our hometown over the twenty years.
The water in this river is harmful because It’s a ______ river.
I won’t go to see the film this evening because I _____ my ticket just now.
--- Where is your mother? --- She _______ to Sichuan on business. She has ______ there four times recently.
Rose feels lonely from time to time because all her friends____________.
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