______是系统运行期的任务之一，目的是对系统的功能和对系统进行中的可靠性、效率、数据与设备的利用情况等进行检查，为系统选用和验收提供依据。

根据要求改变句型，每空一词。

1. The model plane is Nick and Peter's. (对划线部分提问)

    _________ _________ the model plane?

2. There is an English shop near the school.(改为复数)

    There _____ some English _____ near the school.

3. We have some tennis balls. (改成一般疑问句)

    _______ you have _______tennis balls?

4. Climb the tree in the park. (改成否定句)

    ________ ________ the tree in the park.

5. I have a computer. He has a computer, too. (同义转换)

   I have a computer. He ________ _________ a computer.