Maybe put it in parenthesis or maybe wait until the next paragraph. I'm not sure it all depends on your teacher.
What I would do is contact my superior and ask him/her what they would want me to . do. Whatever the superior says then I would have to obey so I don't get fired. If this happens on a daily bases at your job then I would start searching for another job. Once you have found another job that you might like then I would take that one and leave the other one. Or you could just tough it out and your superior will take notice and he/she might offer you a better position. Hopefully this helps.
This is an onomatopoeia. This is because of the words “growled” and “grumbled”.
