(если можно пару примеров с объяснением)1. the crowd in the hall (is / are) waiting for the actor's arrival. 2. a flock of birds (have / has) shown above the water. 3. the police (know / knows) the truth. 4. gymnastics (is / are) his favourite subject. 5. kate's hair (is / are) cut short. 6. our group often (stay / stays) at school after the lessons. 7. your spectacles (is / are) on the table. 8. billiards (was / were) always played in this club. 9. furniture (has / have) become very expensive. 10. some new means of transport (was / were) demonstrated at the exhibition. 11. your uncle's money (has / have) been spent on education.