The phrase "have never met" correctly indicates that they had not met each other before a specific point in the past.

Here are the answers to your English questions: 40. The phrase "have never met" correctly indicates that they had not met each other before a specific point in the past. A) have never met 41. "Since" is used to specify the starting point of a period of time that continues up to the present. C) since 42. The past perfect tense "had eaten" is used to describe an action that was completed before another action in the past (leaving for school). A) had eaten 43. "Yet" is used in negative sentences with the present perfect tense to indicate that something has not happened up to the present moment. A) yet 44. The present perfect continuous tense "has been studying" indicates an action that started in the past and is still ongoing or has just finished, explaining a present condition (looking tired). B) has been studying 45. The present perfect continuous tense "have been playing" indicates an action that started in the past, continued for a duration, and is still ongoing or has just stopped with present relevance. A) have been playing 46. The past perfect tense "had you lived" is used to ask about a duration of time up to a specific point in the past (before deciding to move). B) had you lived 47. The past continuous tense "were doing" describes an action that was in progress when another past action (the teacher entered) occurred. B) were doing 48. The simple past tense "woke up" is used for a completed action that happened at a specific time in the past (yesterday morning). A) woke up 49. Assuming the question is asking for the simple past tense to describe a completed action "during the week," "studied" is the correct verb form. C) studied 50. The present continuous tense "are listening" describes an action that is happening at the moment of speaking. C) are listening 51. Assuming the question is "Is the teacher waiting outside the classroom for a moment?", "Is/waiting" is the correct present continuous form. A) Is/waiting 52. "Does"