English

When changing direct speech to indirect speech, the present perfect tense 'have written' changes to past perfect 'had written' to maintain the sequence of tenses. Option C correctly reflects this change.

The word "glare" means to stare angrily or fiercely, and "scowl" similarly means to frown or look angry, making it a synonym. The other options do not convey this meaning.

The phrase 'wasting your time' is the correct idiomatic expression meaning spending time on something unproductive. The other options do not fit idiomatically in this context.

The correct preposition to use with 'accustomed' is 'to'. The phrase should be 'He is accustomed to hot weather.' The other options are incorrect prepositions in this context.

In the sentence 'I am sick,' the word 'am' functions as a verb, specifically the first person singular present tense of the verb 'to be.'

An escarpment is a steep slope or long cliff that forms as a result of erosion or faulting and separates two relatively level areas of differing elevations. Therefore, 'cliff' is the correct synonym.

The phrase 'It was so nice _____ them' is correctly completed with the preposition 'of' to form 'It was so nice of them.' This is a common English expression used to indicate that someone has done something kind or considerate. The preposition 'to' would require a verb following it (e.g., 'It was so nice to see them'), so it is not correct to complete the phrase as given without additional words. Therefore, 'of' is the correct choice here.

The phrase "gave me the cold shoulder" means to deliberately ignore someone or show them indifference, which matches option D, "ignored me." The other options do not accurately reflect this idiomatic meaning.

The phrase "Your guess is as good as mine" means that the speaker has no idea or knowledge about the answer, indicating uncertainty or lack of information.

The idiom "raining cats and dogs" means it is raining very heavily or pouring rain. This is a common English expression used to describe intense rainfall.