用所给词的适当形式填空。

1. There _____ (be) a picture on the wall.

2. Are there _____(some) teachers in the classroom?

3. There _____(be) two pencils and a pen on the desk.

4. In the classroom,  there _____ (be) ten students and a teacher.

5. There aren't any _____ (apple) in the box.