1. These tomatoes are nine dollars. (对画线部分提问)
    ________ _______ ________ these tomatoes?
2. The girl is my sister. She is in red. (合并一句)
   The girl ________ ________ is my sister.
3. They have a new bike each. (同义句)
    ________ of them ________ a new bike.
4. Can I help you? (同义句) 
    ________ can I ________ ________ you?
5. These pants are short. (同义句)
    These are ________ ________.
6. How much is the pencil? ( 同义句) 
   ________ the ________ of the pencil?