Read the excerpt from "Lather and Nothing Else."

I went on lathering his face. My hands began to tremble again. The man could not be aware of this, which was lucky for me. But I wished he had not come in. Probably many of our men had seen him enter the shop. And with the enemy in my house I felt a certain responsibility.

Which word in this excerpt creates a tense mood?

lathering
tremble
aware
enter