Authorities may tighten policy.Logical formLearned from5 sentences. Commander may tighten rules on a use of airstrikes.Logical formLearned from5 sentences. A country may tighten (fire code).Logical formLearned from5 sentences. A force may tighten policies.Logical formLearned from5 sentences. Members may tighten (defense budgets).Logical formLearned from5 sentences. A world-city may tighten (visa rules).Logical formLearned from5 sentences. (Tax revenues) may tighten.Logical formLearned from5 sentences. Security may be tightened at some embassies.Logical formLearned from5 sentences. A hotel may tighten a security with (metal detectors).Logical formLearned from5 sentences. National surveys may tighten.Logical formLearned from5 sentences. Companies may tighten requirements.Logical formLearned from5 sentences. An international-political-entity may tighten (trade restrictions).Logical formLearned from5 sentences. A law may tighten (security reviews).Logical formLearned from5 sentences. (Border agents) may tighten controls.Logical formLearned from5 sentences. Employers may tighten belts.Logical formLearned from5 sentences.