Parts of a sentence are given below in jumbled order. Arrange the parts in the correct order to form a meaningful sentence.
A. Lying in bed waiting
B. For the postman to bring
C. Him news of a legacy
D. Luck keeps on

The sentence should logically begin with the main subject and action, which is found in segment D ("Luck keeps on"). The phrase "keep on" can be followed by a gerund or present participle, leading directly to segment A ("Lying in bed waiting").
The participle phrase "waiting" naturally requires the prepositional extension found in segment B ("For the postman to bring"). Finally, the verb "bring" takes an indirect object and direct object structure, completed by segment C ("Him news of a legacy").

Combining these segments yields: "Luck keeps on (D) Lying in bed waiting (A) For the postman to bring (B) Him news of a legacy (C)." Therefore, the correct arrangement is DABC.