An ombudsman may close a case.Logical formLearned from17 sentences. A quarry may be closed.Logical formLearned from17 sentences. A country may close a frontier.Logical formLearned from17 sentences. A switch may close.Logical formLearned from17 sentences. A call may close.Logical formLearned from17 sentences. Hospitals may close.Logical formLearned from17 sentences. Polls may close in a country.Logical formLearned from17 sentences. Some investors may close books.Logical formLearned from17 sentences. A high school may be closed.Logical formLearned from17 sentences. (Aviation authorities) may close airspace.Logical formLearned from17 sentences. Highways may close.Logical formLearned from17 sentences. An airport may close for some hours.Logical formLearned from17 sentences. Ones may close.Logical formLearned from17 sentences. A main street may be closed to traffic.Logical formLearned from17 sentences. A sensex may close.Logical formLearned from17 sentences.