16. Please tell me the reason why you cry. A. Please tell me the reason on which you cry. B. Please tell me the reason in which you cry. C. Please tell me the reason at which you cry. D. Please tell me the reason for which you cry. 17. That is the house where my teacher is living now. A. That is the house on which my teacher is living now. B. That is the house in which my teacher is living now. C. That is the house at which my teacher is living now. D. That is the house for which my teacher is living now. *Choose the best sentence that can be made from the cues given. 18. Where/you/working/now? A. Where are you working now? B. Where do you working now? C. Where were you working now? D. Where did you working now? 19. What/she doing/when/saw/her? A. What is she doing when you saw her? B. What about she doing when you saw her? C. What were she doing when you saw her? D. What was she doing when you saw her? 20. How /students/ there /your class?. A. How much students are there in your class? B. How much students is there in your class? C. How many students are there in your class? D. How many students is there in your class?