**Rule:** The Future Continuous Tense (will be + verb-ing) is used to describe a longer action that will be in progress at the same time as a shorter future action ('while you are in class'). It contrasts the two concurrent future activities. Option (d) suggests the shopping will be finished. Options (b) and (c) are incorrect.

**Rule:** The Simple Future with 'will' is often used with adverbs of uncertainty like 'perhaps', 'probably', or 'maybe'. 'I'm not sure' confirms the uncertainty, making 'will go' the best fit. Options (a) and (d) imply a more definite plan, which contradicts the uncertainty expressed.

**Rule:** This sentence requires the Future Perfect Passive voice (will have been + past participle). The 'food' is the object of the action. The action of eating will be completed by a specific future time ('by the time the latecomers arrive'). Option (a) is active. Option (b) is future continuous active. Option (d) is simple present active.

**Rule:** The Simple Future with 'will' is used to make a promise or a spontaneous offer. In this context, the speaker is reassuring someone and promising to perform an action in the future. It's a decision made in response to the situation. Option (c) would imply a prior plan, which is possible but less natural as a spontaneous reassurance.

**Rule:** The Future Perfect Tense (will have + past participle) is used to show that an action will be finished before another future event. The preparation of the meal will be completed before the guests are seated. Option (a) doesn't emphasize completion. Options (b) and (c) are incorrect tenses.

**Rule:** The Future Perfect Tense (will have + past participle) is used to talk about an action that will be completed by a specific point in the future. 'By the end of his career' is the future point by which the action of breaking records will be complete. Option (a) suggests the action will be in progress at that time.

**Rule:** 'Be going to' is used to make a prediction based on present evidence. The fact that 'the team has been practicing hard' is the evidence leading to the prediction of a win. Option (d) is a more general prediction not necessarily based on current evidence.

**Rule:** The Future Perfect Tense (will have + past participle) is used to talk about an action that will be completed or a total that will be reached by a certain time in the future. If he fails next week, the total number of failures will reach three. This completion of a total is expressed with the future perfect. Option (b) just states the future failure, but not the cumulative number.

**Rule:** In a future time clause ('as soon as...'), the Simple Present Tense is used. Here, the passive form is required because the 'plan' receives the action. Therefore, the simple present passive ('is finalized') is correct. Using a future tense like (a) or (c) in the time clause is incorrect.

**Rule:** The Simple Future with 'will' can be used to describe the content or purpose of something, like a book, film, or presentation. It's a statement about what the documentary is set to do in the future (when it is watched). Option (c) would be used if discussing it as a timeless piece of media. Option (a) implies it's a current, ongoing process.