'Could' is used to express past possibility or surprise in this context.

This refers to physical ability, so 'can' is used.

'will' is used for future certainty or arrangement.

'Might' is used to express remote possibility. It is used here to indicate the possibility of an outcome.

'Used to' expresses a past habit. The context indicates a habit during holidays in the past.

'Could have' + V3 expresses a past possibility that was not realized.

'can' or 'may' is used with 'so that' to express purpose.

'will be' is used here to denote a planned action in the future.

'Would you...' is used for a polite request.

Based on the provided answer key, (2) is chosen. Grammatically, 'ought to have' or 'should have' is preferred, but 'need to' is marked as the answer in the source.

'Would you like to...' is a standard polite expression for offering or asking for preferences.

'Ought to' indicates moral obligation, which is the correct fit for 'obey elders'.

'must' is used here to express strong likelihood.

Explanation - 'must' is used in the sentence because payment of tax is mandatory, and 'must' is used where a task is mandatory.

The sentence is in the past tense (ran), so 'could' is used.

'Must' is used to express compulsion or prohibition (in negative). Since there is a speed limit, driving fast is prohibited/compulsory not to do.

'Must' is used for strong obligation.

'Must' is used for strong advice or obligation.

'Used to' expresses past habits.

Here, advice is being given that one should not have done such a thing, so 'oughtn't to' is appropriate.