A. for
B. with
C. in

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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1. The stamp is two yuan. (对画线提问)
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2. Turn left at the traffic lights. (否定句) 
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3. I have nine postcards. (对画线提问)
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4. I live with my mother. (改为一般疑问句) 
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5. I live in China. (用he代替I 改写句子)
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1.   my      I      am      to      mother      writing      letter      a   
                                                                                                   
2.   a    you      need       Do       stamp
                                                                 
3.   I     do      the     Where      stamp      put