按要求改写下列各句，每空一词。
1. That bag is black. ( 改为同义句)
    That _____ a _____ bag.
2. This is a T-shirt. (改为复数句子)
    _____ are _____.
3. I like Chinese. (改为否定句)
    I _____ _____Chinese.
4. The boy under the tree is Li Lei. (对划线部分提问)
    _____ _____ is Li Lei?
5. What's the price of the dictionary? (改为同义句)
    _____ _____ is the dictionary?