用所给动词的适当形式填空。

1. At the weekend. I usually go ______ (run) for half an hour.

2. My brother often ______ (fly) a kite with me in the park on Sundays.

3. He spends about an hour ______ (watch) TV every day.

4. We ______ (not have) any classes on Sunday.

5. Let him ______ (dress) up as a ghost.

下列关于视图的说法中，错误的是______。

A．视图是从一个或多个基本表导出的表，它是虚表

B．某一用户可以定义若干个视图

C．视图一经定义就可以和基本表一样进行查询、删除和更新

D．视图可以用来定义新的视图