**Rule:** The Simple Future with 'will' is used to make a spontaneous offer of help. The speaker hears about the problem ('I can't find my keys') and immediately decides to help. Option (d) would suggest a prior intention to help, which doesn't fit the context. Options (a) and (c) are incorrect.

**Rule:** The Future Continuous Tense (will be + verb-ing) is used to talk about an experience that will be in progress at a specific time in the future. It describes the state of 'feeling the effects' at the point of 'this time tomorrow'. Option (b) is a simple prediction, but (d) emphasizes the ongoing experience.

**Rule:** The Future Perfect Tense (will have + past participle) is used to describe an action that will be completed before a specific point in the future. The phrase 'By the time you arrive' sets a future deadline. Therefore, the action of finishing the presentation will be completed before that time. Option (a) 'will be finishing' (Future Continuous) describes an action in progress at a future point. Option (c) 'will finish' (Simple Future) indicates the action will happen in the future but doesn't emphasize completion before another event. Option (d) 'are finishing' (Present Continuous) is typically used for fixed future arrangements, which doesn't fit the context of completion.

**Rule:** The Future Perfect Tense (will have + past participle) is used to express that an action will be completed by the time of another future event. The reading of the book will be finished by the time the other person returns. This completion is necessary for the discussion to happen. Option (a) does not guarantee completion.

**Rule:** The Future Continuous Tense (will be + verb-ing) is used to describe an event that will be in progress at a specific time in the future. At 'this time next year', the celebration will be happening. This is a very common way to talk about future milestone events. Option (a) implies the celebration is already over.

**Rule:** The Future Perfect Tense (will have + past participle) is used to mark the completion of a duration of a state ('for five years') by a specific future point ('by her next birthday'). It emphasizes the milestone being reached. Option (a) simply states her status on her birthday, not the duration leading up to it.

**Rule:** The 'be going to' future is used for predictions based on clear, immediate, present evidence. 'The look of those clouds' provides the visual evidence for the imminent downpour. Option (b) is for predictions without such strong present evidence.

**Rule:** The Future Continuous Tense (will be + verb-ing) can describe an action that is expected to be in progress during a future period. The sentence implies that for the next little while, the students will be in the process of finishing. Option (d) would mean they are already done. Option (c) is a prediction of when they will finish, not what they are doing now.

**Rule:** The Future Continuous Tense (will be + verb-ing) can be used to refer to future events that are fixed or decided (similar to the present continuous). It implies a planned action that will be in progress. In this context, her departure is a planned event. Options (b) and (c) are also possible, but (a) emphasizes the action as part of a course of events.

**Rule:** This is a First Conditional sentence ('if' + simple present, ... 'will' + base verb) expressing a certain or highly likely future result of inaction. The main clause correctly uses 'will die' to state the future consequence. Option (c) is for hypothetical situations. Option (b) would be for a general truth (Zero Conditional).