6. The workers went on strike because they thought their wages were too _____
D) low is the most suitable option here. "Low wages" means that the workers were not being paid enough for their work.
7. The explorer _____ all the way to the source of the river by boat
B) traveled is the correct choice. "Traveled" implies the act of moving from one place to another, which fits the context of the explorer's journey.
8. When the bill came, he had to _____ money from his brother to pay it.
A) borrow is the appropriate answer. "Borrow" means to take something temporarily with the intention of returning it later.
9. Because the company was doing more business, it was necessary to _____ the factory.
A) extend is the best option. "Extend" means to make something longer or larger, which fits the context of expanding the factory to accommodate increased business.
10. The farmer had to wear heavy boots in the winter because the fields were so wet and _____
E) muddy is the correct term. "Muddy" describes something covered in or soaked with mud, which is likely the condition of the fields in winter.