Read the following passage.
Whenever we go to see our friend, we take the bus, which is usually an express bus, except on weekends. We have learned after taking the bus so many times that we will have to wait a long while for it because the bus is almost always late. We don't mind, and because we are used to it, we always ride it.
In the passage, which characteristic of sentence structure is the most evident?
very formal organization
complex sentence structure
varied sentence lengths
simple sentences