______ Mr. Ruan saw him, he was using his cell phone. ______ other students were reading, he was using his cell phone. ______ Mr. Ruan walked in the classroom, he looked around to make sure no students were using cell phones. I found one student using his cell phone _______ I took the photo. I like to listen to musci ______ I do homework.
Choose from “when, while, as” to complete the sentences.
When
When
While
As
when
as