This seems like a homework problem. Would anyone clarify for me if we are allowed/not allowed to answer these types of questions? Q1: The best option is B. The statement about his driving has to be in future perfect tense "will have to drive" because he hasn't arrived yet, so the driving is occurring in the future, but by the time he arrives it'll be in the past. Q2: I would say none of these answers are correct. In my experience, we would receive a "Letter of Acceptance". Choice A makes no sense, because a complaint would not make someone glad. Choice B does not make sense grammatically. Choice C doesn't make sense, because she does not have a relationship with the company yet (and thus there is nothing to give her permission to do). Choice D could make sense, but is not a common phrase. If you have to pick, use Choice D. Q3: A and D are incorrect because they refer to a "teaching theory" when the original sentence refers to a separate "teacher" and "theory" (that is being taught). C is incorrect, because the teacher is removed from the sentence. Without a reference to the teacher, it appears that the students are explaining the theory. This does not make sense. Choice B is functionally fine, but it should read "Despite the teacher's clear explanation of the theory ..." The teacher takes ownership of the theory.