Things(A) are getting(B) better and better when(C) time goes on(D).
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Joan sang(A) while(B) she walked along(C), with(D) a book in her left hand.
Jack was washing(A) dishes(B) then(C) Mary knocked at(D) the door and entered.
No sooner(A) he left(B) Beijing than(C) his mother fell sick(D).
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