Teacher:You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.
Teacher: Now, understand the problem? Solve this instance: she was actually stricken dumb for five seconds it was unsupposable that marilla was making fun of her but missus rachel was almost forced to suppose it are you in earnest marilla she demanded when voice returned to her yes of ____
Student:
course