根據(jù)句意和提示，在空格內(nèi)寫出各單詞的正確形式

The ________(首都)of the USA is Washington DC．

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I'm sorry I ________(keep)you waiting for such a long time．

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He with his classmates ________(exercise)every morning．

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My cousin's lovely cat ________(die)two days ago．

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The children ________(enjoy)themselves in the park at the moment．

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There ________(be)a talk show on CCTV-4 at nine this evening, isn't there?

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I often hear her ________(sing)in the next room．

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The small village ________(turn)into a modern town in the past ten years．

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－I called you just now, but you didn't answer．

－Sorry, I ________(discuss)with my sister about homework．

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When I came in, I saw a purse ________(lie)on the floor．