Added the key "topic" to Writing, Speaking and Interactive Speaking exercises

src/interfaces/exam.ts

@@ -148,6 +148,7 @@ export interface WritingExercise {
 		solution: string;
 		evaluation?: CommonEvaluation;
 	}[];
+	topic?: string;
 }
 
 export interface SpeakingExercise {
@@ -162,6 +163,7 @@ export interface SpeakingExercise {
 		solution: string;
 		evaluation?: SpeakingEvaluation;
 	}[];
+	topic?: string;
 }
 
 export interface InteractiveSpeakingExercise {
@@ -175,6 +177,7 @@ export interface InteractiveSpeakingExercise {
 		solution: {questionIndex: number; question: string; answer: string}[];
 		evaluation?: InteractiveSpeakingEvaluation;
 	}[];
+	topic?: string;
 }
 
 export interface FillBlanksExercise {