Question 17. Put the sentences (a-c) in the correct order, then fill in the blank to make a logical text.

Last month, our class participated in a volunteering project to help clean up a nearby beach. The day was full of unexpected events. ________
a. Just as we started, it began to rain heavily, forcing us to take shelter under some trees.
b. Once the rain stopped, we resumed our work with even more determination to finish cleaning the beach.
c. We collected plastic waste, glass bottles, and other trash that had been washed ashore.