(Energy supplies) may tighten.Logical formLearned from7 sentences. Immigration may be tightened.Logical formLearned from7 sentences. Authorities may tighten screws.Logical formLearned from7 sentences. Central banks may tighten credit.Logical formLearned from7 sentences. Persons may tighten an (immigration system).Logical formLearned from7 sentences. A government may tighten curfew.Logical formLearned from7 sentences. Israeli troops may tighten curfews.Logical formLearned from7 sentences. Airports may tighten security attacks.Logical formLearned from7 sentences. Israeli troops may tighten a control.Logical formLearned from7 sentences. An international-political-entity may tighten (money-laundering rules).Logical formLearned from7 sentences. Security may be tightened at nuclear-power plants.Logical formLearned from7 sentences. A US-city may tighten a defense.Logical formLearned from7 sentences. Banks may tighten belts.Logical formLearned from7 sentences. A country may respond by tightenning a blockade of towns.Logical formLearned from7 sentences. A country may tighten a blockade of towns.Logical formLearned from7 sentences.