Some children may test positive for a virus.Logical formLearned from9 sentences. An exercise may test an ability.Logical formLearned from9 sentences. A pretext can be for testing a missile.Logical formLearned from9 sentences. (Water samples) may be tested.Logical formLearned from9 sentences. A major may test for drugs.Logical formLearned from9 sentences. Some swimmers may test positive for drugs.Logical formLearned from9 sentences. Astronauts may test equipment.Logical formLearned from9 sentences. A laboratory may test samples.Logical formLearned from9 sentences. A country may test a design.Logical formLearned from9 sentences. Samples may be tested at a laboratory.Logical formLearned from9 sentences. A left-hander may test positive.Logical formLearned from9 sentences. Teams may test some riders.Logical formLearned from9 sentences. Police may test substances.Logical formLearned from9 sentences. A cow may test positive for mad-cow disease.Logical formLearned from9 sentences. Persons may be tested positive.Logical formLearned from9 sentences.