Write the correct form and compound of the words in brackets

17.  I think electric cars are more ___[color1]_______than petrol cars because they don’t produce air pollution. (FRIEND)

18.  Buses in this country aren’t __[color2]_________. They’re often late. (RELY)

19.  Traveling by train is the best option for long-distance travel. They are clean, __[color3]________and punctual. (COMFORT)

20.  MTR (Mass Transit Railway), with ten lines and more than 70 stations, is the most_[color4]_________ 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  ___[color5]_______. (QUICK)

22.  In the UK, there are several ___[color6]_______kinds of public transportation. (DIFFER)