A world-city may keep_up protests.Logical formLearned from4 sentences. A male may keep_up with a ferraris.Logical formLearned from4 sentences. A country may keep_up a blitz.Logical formLearned from4 sentences. A world-city may keep_up pressure on a world-city.Logical formLearned from4 sentences. A country may keep_up a tirade.Logical formLearned from4 sentences. Gunships may keep_up a bombardment of a route.Logical formLearned from4 sentences. Aircraft may keep_up attacks.Logical formLearned from4 sentences. Russian forces may keep_up an offensive.Logical formLearned from4 sentences. A person may keep_up a (name calling).Logical formLearned from4 sentences. A person may keep_up with stats.Logical formLearned from4 sentences. An army may keep_up an offensive.Logical formLearned from4 sentences. Demonstrators may keep_up attempts.Logical formLearned from4 sentences. Separatists may keep_up resistance.Logical formLearned from4 sentences. Separatists may keep_up pressure on russian forces.Logical formLearned from4 sentences. A US-city may keep_up a pace.Logical formLearned from4 sentences.