单词辨音 （本大题共5分，每小题0.5分）
---Excuse me, sir. Could you please tell me _______?--- Sorry, I don’t know. You can go to the information desk.
---Jim, can you finish your homework on time?---______. I can finish it.
We are sure to enter a better high school ________ we work hard.
We must protect water from being _________, because it’s the source of life.
My father ______ in China for 20 years already. He thinks his job is great.
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