Fill in the blank with the correct word.People who work at night have to ……… themselves to sleeping in the day time.adjoinadjoinoutfitprofuseadapt

To fill in the blank in the sentence "People who work at night have to ……… themselves to sleeping in the day time," the correct word is "adapt."

Explanation:

1. Contextual Meaning: In this context, "adapt" means to adjust or modify one’s habits or routines to fit a different environment or schedule, which in this case is sleeping during the day.

2. Word Definitions:

   • Adjoin: To be next to or in contact with something.
   • Outfit: To equip or supply with necessary goods or apparel.
   • Profuse: Abundant; generous in amount or number.
   • Adapt: To make suitable to requirements or conditions; to adjust.

Therefore, the completed sentence will be: "People who work at night have to adapt themselves to sleeping in the day time."