Here are the correct answers for the multiple-choice questions:

19. **A. should** (You should ask the teacher to help you if you don't understand the lesson.)
20. **C. traffic** (In Dubai, the traffic is so bad that it is quicker to walk than to go by car or bus.)
21. **B. happen** (That is a film about strange and frightening things that may happen in real life.)
22. **D. eyes** (I can’t take my eyes off the screen because the film is so interesting.)
23. **C. laugh** (A comedy is a film that tries to make people laugh.)
24. **D. careful** (In spite of careful preparation, they had a lot of difficulties in making the film.)
25. **D. happens** (The festival is on the last day of October every year.)
26. **B. suffer** (Big cities often suffer from traffic jams every day.)
27. **C. make** (One problem in big cities is that too many people make the road.)

Feel free to ask if you need further assistance!