1.   A bell rang, and for a moment they could hear two voices arguing.

2.   Again the great bell rang out.

3.   All the students were out of their seats as soon as the bell rang.

4.   As soon as the bell rang the class were on their feet and out of the door.

5.   At that moment the front door bell rang and Sophia went to answer it.

6.   At that moment, the door bell rang.

7.   But alarm bells rang when Allison wrote back in December.