TASK DEFINITION: In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.
PROBLEM: Sentence 1:Sandra , for the first time during her career , now participated actively in composing and writing the album . Sentence 2:Therefore , the lyrics of the songs are more personal , with Sandra revisiting her childhood and all her sad experiences in them .

SOLUTION: therefore

PROBLEM: Sentence 1:In Classical Chinese , pronouns were overtly inflected to mark case . Sentence 2:However , these overt case forms are no longer used ; most of the alternative pronouns are considered archaic in modern Mandarin Chinese .

SOLUTION: however

PROBLEM: Sentence 1:Atheromata continue to be the primary underlying basis for disability and death , despite a trend for gradual improvement since the early 1960s ( adjusted for patient age ) . Sentence 2:Thus , increasing efforts towards better understanding , treating and preventing the problem are continuing to evolve .

SOLUTION:
thus