句型转换。 1.There are a lot of sheep on the hill. (改为否定句) There ________  ________sheep on the hill. 2. There is a lot of chocolate in the box.(改为否定句) There ________ ________ chocolate in the box. 3. She studies for three years in America. (对划线部分提问) ________  ________ ________ she ________ in America? 4. This book isn't the same as that one. (改为同义句) This book ________ ________ ________that one. There are some________ between this book and that one.