Question 17 Buses in this country aren’t _reliable____  . They’re often late. (RELY)
Question 18. They are friendly    and help me practice English every day. (FRIEND)
Question 19. Today, we get a lot of energy from fossil fuels: coal, oil, and   _natural______   gas. (NATURE)
Question 20.
The Thames Festival is an annual   CELEBRATion_____   of the River Thames in London with many exciting events and talks. (CELEBRATE)