?

To fill in the blanks with the correct Russian words, focus on inserting short prepositions or adverbs:

1. В — Your teacher smiled at you as he looked over his glasses, then at his book. (Л.Н. Толстой)
2. И — A wordless soul seemed to have visited his face and eyes for maybe the first time. (Л.Н. Толстой)
3. Ни — No to whom listen, if you have your own melodious talent playing. (Ф.М. Достоевский)
4. В — Stars fly, heading towards each other in loneliness. (А.П. Платонов)

Note that these should be adjusted based on context for full accuracy.