Choose the part of knowledge that you are good at, or you can decide the content by looking at the rich materials at hand. Of course, you can also listen to your tutor's advice-communicate with your tutor when necessary, which will be of great help to your thesis.

When the topic is determined, the direction is determined at the same time.

If you are really embarrassed, look for books on verbs, spoken English, Chinese-Russian translation, grammar and so on. These books are easy to find in bookstores and libraries, and I believe your teachers may also have many. It is easier to read those contents and write according to those materials.

At present, the topic of my thesis for two students is: Russian homophones and the categories of modal particles in spoken language. The following topics can be considered: the contrast of cultural differences implied in Chinese and Russian proverbs, the usage of verbs in spoken language, the analysis of abbreviations in spoken language, the similarities and differences between Chinese and Russian wine (or tea) cultures, directional verbs and non-directional verbs. These topics are related to teachers and classmates recently, which may be helpful to you.

Come on, the paper is not difficult.