The key answer of exercise 2
The key to exercise solutions in chapter 2.4 - Grammar for the textbook Wider World 4 - Student's Book with authors Suzanne Gaynor, Kathryn Alevizos and Carolyn Barraclough from Pearson Education
Question
Watch or listen. Why does Skye trip up when she's jogging in the park?
Answer
because there's a lot of rubbish in the park