You are taking a TOEFL test. The person who is administering the test is reading out the instructions for the test from a script that was written for the test. She reads the following line about when it's OK to use the bathroom:
During the break between sections 1 and 2, if you need to use the restroom, you may do so.
This phrase is used when you want to express that an event happens within a certain period of time. For example:
During the month of May, we'll be introducing several new improvements to the site.
You can also use the order "(independent clause) during (an event)"
It's really annoying when people talk during a movie.
"A break" is a short period of rest between periods of work.
This is a formal way of saying "do that". Before using "do so", you need to introduce an action:
If you're interested in buying stocks, you can do so with the help of a broker
In casual speech, "do so" is replaced by "do that" or "do it"
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