Use the correct form of the words in brackets. Choose the best answer (A, B, C, or D) (1.0pt)
31. There has been a rapid increase in the urbanisation rate. (increase)
32. There has been a gradual decrease in the rural population. (decrease)
33. The line graph illustrates how the world population has changed. (show changes)
34. House prices in big cities have increased a lot over the past decade. (go up)
35. The air quality in urban areas has become worse over the years. (worsen)
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