Both contingency and inevitability are concepts that only appear in human history, but Marx did not talk about fate. If you insist on putting them together, look at it this way. Human efforts are a necessity, while your own efforts are a contingency in the whole process. Fate is like human being's strength is greater than yours, but the strength of fate can't be separated from your contingency. If Qian Qian's absolute contingency power disappears, the power of fate will also disappear. So don't lose heart in front of the whole class. After all, you also control your own destiny.