1. His appeals for help went unanswered, and he resigned from the police force.

2. The argument in the new paper leaves a lot of unanswered questions, he said in an email.

3. Many of these questions that we have asked remained unanswered, he said.

4. We realize there are many unanswered questions and that this is a very upsetting situation.

5. Calls to the space program rang unanswered Friday, a public holiday.

6. Phone calls to the Crimean legislature rang unanswered, and its website was down.