Generally we don’t use any article when a country name is mentioned but here ‘United Kingdom’ suggest a particular place where the speaker’s sister lives and therefore ‘the’ will be correct article to use.

‘Kilo’ is a general measurement quantity and therefore indefinite article will be used. The word begins with a consonant sound and ‘a’ will be the correct article to use.

‘The’ is used as a definite article for a thing or person when the reader knows which one we are exactly referring to. It states the specific nature of the subject.
Option D is correct as ‘The’ refers to a particular subject & shows the uniqueness of the subjects.

The writer is talking about a particular pond. So, we need to use the definite article ‘the’.

‘Amazing thing’ is general not something specific. ‘An’ article will be used because ‘amazing’ begins with a vowel sound.

Here, ‘speech’ is a general class and therefore indefinite article will be used. Word after the blank starts without vowel sound. ‘A’ article will be used.

An indefinite article is used when we are talking generally about something. As ‘unusual’ is a complement to the noun ‘dress’, and starts with the vowel ‘u’, the blank shall take ‘an’.

‘Bible’ is a specific book. So, ‘the’ article will be used.

Articles are part of speech, used to indicate nouns and to specify their application. Definite articles (the) limit the meaning of a noun to one particular thing. Indefinite articles (a, an) indicate that a noun refers to a general idea and not a particular thing.
The given sentence talks about a particular cafe, so a definite article must be used before it.