'Kubla Khan' (1797) is a famous poem by S. T. Coleridge.
T. S. Eliot was born in St. Louis Missouri USA in 1888.
O. Henry = pen name of William Sydney Porter.
'Pernicious' = harmful. Direct opposite: 'Innocuous' = not harmful.
'Not too difficult to understand' — 'too + adj + to + verb' structure.
'Since' + present perfect: 'have not had'.
Second conditional: If + past simple → would + base verb.
'It's time + subject + past simple verb' — 'you realized'.
'Enter into' an agreement = correct phrasal verb for formal arrangements.
'Would rather + V + than + V' = preference structure.
'Put up with' = tolerate/endure patiently — direct synonym.
'Slowcoach' = a very slow or lazy person who falls behind.
'Shortly' is an adverb. Verb form = 'Shorten' = to make shorter.
'Let' takes objective case. 'him' (not 'he') is the objective form.
'Police' is plural → 'were'. 'Informed of' is the correct passive structure.
Who/which/what introduce relative clauses — relative pronouns.
'Misspell' = mis + spell. Double 's' is required.
'By your watch' is the standard idiomatic expression.
'Give my compliments' = standard expression for sending regards.
'Caesar and Cleopatra' (1898) is a historical play by George Bernard Shaw.