Write the correct form or compound of the words in brackets.

17. I think electric cars are more __________ than petrol cars because they don’t produce air pollution. (FRIEND)

18. Buses in this country aren’t ___________. They’re often late. (RELY)

19. Traveling by train is the best option for long-distance travel. They are clean, __________ and punctual. (COMFORT)

20. MTR (Mass Transit Railway), with ten lines and more than 70 stations, is the most __________ way of traveling in Hongkong. (CONVENIENCE)

21. I like traveling by motorbike because it’s a great way to get around Hồ Chí Minh city  __________. (QUICK)

22. In the UK, there are several __________ kinds of public transportation. (DIFFER)