Insurgents may keep_up ambushes.Logical formLearned from4 sentences. A (b-52 bomber) may keep_up bombardment of positions.Logical formLearned from4 sentences. Jets may keep_up bombardments with explosions.Logical formLearned from4 sentences. Jets may keep_up poundings of a capital.Logical formLearned from4 sentences. A world-city can be intent on keep_upping ties.Logical formLearned from4 sentences. Macedonians may keep_up some blockades of (border crossings) with province.Logical formLearned from4 sentences. (Search crews) may keep_up a search.Logical formLearned from4 sentences. A country may keep_up an onslaught.Logical formLearned from4 sentences. A male may keep_up with public opinion.Logical formLearned from4 sentences. A person can be worried about keep_upping with problems.Logical formLearned from4 sentences. A US-president may keep_up calls to leaders.Logical formLearned from4 sentences. Education may keep_up with an onslaught of new drugs.Logical formLearned from4 sentences. (Drug education) may keep_up with an onslaught of new drugs.Logical formLearned from4 sentences. A (space agency) may keep_up a pace.Logical formLearned from4 sentences. Militants may keep_up attacks.Logical formLearned from4 sentences.