(Slot machines) may ring.Logical formLearned from2 sentences. A mayor may ring a bell.Logical formLearned from2 sentences. Calls to headquarters may ring unanswered.Logical formLearned from2 sentences. An office may be ringed by (blast barriers).Logical formLearned from2 sentences. German police may be ringed.Logical formLearned from2 sentences. A phone may ring with (death threats).Logical formLearned from2 sentences. Protests may ring.Logical formLearned from2 sentences. Bases may ring an airport.Logical formLearned from2 sentences. Calls to a (disease control center) may ring unanswered.Logical formLearned from2 sentences. A tent may be ringed by guards.Logical formLearned from2 sentences. (Riot police) may ring an embassy.Logical formLearned from2 sentences. Services may ring an alarm.Logical formLearned from2 sentences. (Hospital telephone lines) may ring busy.Logical formLearned from2 sentences. An outcrop may ring a portion of a crater.Logical formLearned from2 sentences. A pope may ring in a civic-holiday.Logical formLearned from2 sentences.