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?

SQL语言中对权限回收的命令是【 】。