. Put a tag question at the end of the sentences 1. In big cities, life can become very difficult and unpleasant, ____________? 2. The world will soon become overpopulated, ____________? 3. You haven’t gone to Rio de Janeiro, ____________? 4. They didn’t like the film, ____________? 5. Jeju Island looks very peaceful, ____________? 6. We don’t have to go yet, ____________? 7. You don’t like pollution, ____________? 8. I think a megacity is a very large city with big population, ____________? 9. You won’t tell anyone, ____________? 10. The number of English speakers is increasing very quickly, ____________?