Sentence: A sentence consisting of a subject-predicate phrase or a single word. Which of the following options is a single sentence. ['as a bony man, it is better to stand and die than to live on his knees.', 'if you want to appreciate our gardens, Suzhou gardens should not be missed.', 'we should think carefully before answering the question so as not to revise it later.', 'due to long-term overwork, Li is finally sick and hospitalized.']