句型转换。

1. The room is very small. It can't hold so many people. (合并为一个简单句)

    The room isn't ______ ______ to hold so many people.

2. She couldn't find an ad for the Canon digital camera at first. (改为被动语态)

     An ad for the Canon digital camera couldn't ______ ______ at first.

3. Her daughter missed her very much. She rang her up very often. (合并为一个复合句)

    Her daughter missed her ______ much ______ she rang her up very often.

4. We had some pictures taken in the middle of the square. (改为否定句)

    We ______ ______ any pictures taken in the middle of the square.