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It is said that potato chips in KFC _____ by mistake about one hundred years ago.

用括號內所給單詞的正確形式填空。
1. It is said that potato chips in KFC _____ (invent) by mistake about one hundred years ago.
2. It is reported that the Underground Line No.3 _____ (build) next year.
3. Metal _____ (use) for making machines and many other things.
4. Nick _____ (offer) a job in a bank, but to our surprise, he didn't take it.
5. Trees and flowers _____ (plant) every year to make our country more beautiful.