句型转换。

1. My father played cards yesterday. (变为一般疑问句)

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2. Danny can fly a kite. (变为否定句)

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3. The girl is singing a song. (对画线部分提问)

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4. The stamp is ten yuan. (对画线部分提问)

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锅炉大、小修后应做的试验有（）、（）、（）。