**Rule:** The Simple Future with 'will' is the standard choice for making general, long-term predictions, especially after verbs like 'predict'. Option (d) is also for predictions but is often based on more present evidence, whereas this is a general forecast. Options (a) and (c) are incorrect.

**Rule:** The Simple Future with 'will' is often used to state official arrangements or future facts. The implementation of a law is a formal, planned future event. Option (a) 'is coming' is also possible for planned events. Option (b) is present perfect. Option (d) is past tense.

**Rule:** 'Will you...?' is a common and direct way to make a request for future help or action. It asks about the other person's willingness to do something. Options (a) and (c) are incorrect tenses. Option (d) is grammatically incorrect for a simple future request.

**Rule:** The Future Perfect Tense (will have + past participle) is used for an action or state that will be completed by a certain future time. 'By the time he is thirty' sets the future deadline for achieving the state of being a millionaire. Option (d) is future continuous. Options (a) and (b) are present tenses.

**Rule:** The Future Continuous Tense is used here to ask politely about someone's plans or to see if our plans fit with theirs. It's a way of asking about an action that will be in progress ('waiting') when another event happens ('our train gets in'). Option (d) asks if the waiting will be finished, which makes no sense.

**Rule:** 'Will' is used for making strong predictions based on opinion or belief (e.g., after 'I'm sure', 'I think'). 'Is going to' is used for predictions based on present evidence. While his studying could be seen as evidence (making 'c' possible), 'will' is the more common and natural choice to express personal certainty or belief about the future. Options (a) and (b) are incorrect.

**Rule:** The Future Perfect Continuous Tense (will have been + verb-ing) is used to emphasize the duration of an activity ('for hours') that will happen before another event in the future ('Before the guests arrive'). It focuses on the length of the cleaning process up to that point. The simple future perfect 'will have cleaned' would focus only on the result (a clean house).

**Rule:** 'Be going to' is used to make a prediction based on present knowledge or experience. The speaker is advising preparation based on the expectation that the exam will be difficult. This implies a prediction. Option (b) is future perfect. Options (a) and (d) are incorrect.

**Rule:** 'Will you...?' is a standard and polite way to make a request for immediate future action. The speaker is asking for help because of their current situation ('My hands are full'). Options (a), (b), and (d) are grammatically incorrect for making this type of request.

**Rule:** The Future Perfect Tense (will have + past participle) is used to describe a change of state that will be completed by a specific future time. The state of 'becoming fluent' will be achieved by the end of the course. Option (b) is a simple prediction, but (c) emphasizes the completed result at a deadline.