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This is a case of 'seeking permission'. We use either 'may' or 'could' for the same purpose.

In cases like this, no mood is expressed and it is a case of probability of happening of an action. In such cases, we use 'will' as an auxiliary, which means 'nobody is sure'.

The word 'lest' is always followed by modal 'should'.

Case of subject-verb agreement. Here we need to keep two things in mind - 1. this is a general statement of fact (present tense), 2. two different subjects are discussed here. Considering these, option 2 seems fit.

Case of subject-verb agreement. 'One of' is always followed by a singular auxilary. Now here option 1 and 3 both are singular, but 'today' in the sentence demands present tense auxilary. Thus, option 1.

This is a general statement of fact (present tense). Two subjects (or nouns) are discussed that demand plural auxilary. Hence, 'bring' is the correct option.

Verb 'carried' shows that this is a fact of the past tense. Now 'luggage' is a singular noun or subject, and it needs singular auxilary. Thus, option 1.

Here clothing is taken as a single piece of dress. And bieng a singular noun, it needs a singular auxilary. Hence, option 1.

Generaslly, one does not live at, in or on post office as the same is not a place to live in. Yes, but one can live near or beside post office. Hence, option 1.

To refer to persons (in subjective cases) we use relative pronoun 'who'.

We live 'in' a house, but we live 'at' an adress.

We live 'in' a house (either big or small), but we live 'at' an adress.

The sentence implies thta this quotation is extracted or taken 'from' the words of Keats.

The sentence implies that he is acceptable to me despite all his faults. For this, preposition 'with' is the best usage.

Here usage of article 'the' with the books specifies that we are referring to some special or particular books. And to show this specification, we prefer relative pronoun 'that' to 'which'.