1. 问题   teach   question   lesson   examination   Hint Half-n-half Clue   2. 更正   lesson   examination   correction   study   Half-n-half Clue   3. 答复   mark   answer   correction   study   Half-n-half Clue   4. 考试   teach   study   examination   answer   Half-n-half Clue   5. 研究   examination   mark   teaching   study   Half-n-half Clue   6. 家庭作业   study   homework   learn   answer   Half-n-half Clue   7. 学会   teach   learn   question   examination   Half-n-half Clue