Select the most appropriate adjective to fill in the blank. Life in Delhi is…

Concept: Adjectives have three degrees of comparison. The positive degree (e.g., 'fast') states a quality without comparison. The comparative degree is used when two things, or two groups of things, are being compared, and is formed by adding '-er' to short (one-syllable) adjectives or by placing 'more' before longer adjectives. The superlative degree is used when three or more things, or groups of things, are being compared, and is formed with '-est' or 'most', usually preceded by 'the'.

Application:

1. The blank is immediately followed by 'than', which is the standard marker that a comparative-degree adjective is required in this slot, not the positive or superlative form.

2. 'Fast' is a one-syllable adjective, so its comparative form is created by adding the suffix '-er': fast -> faster.

3. Filling the blank with 'faster' completes the sentence with the grammatically required comparative form: 'Life in Delhi is faster than other cities.'

Cross-check:

• The word 'than' right after the blank rules out the positive form 'fast', which needs no comparison marker at all.

• It also rules out the superlative 'fastest', which pairs with 'the' rather than 'than', and rules out 'more fast', since 'more' does not combine with a short, one-syllable adjective such as 'fast' in standard comparative formation.