21.   The engineering puzzle was how to include a third row of seats that could truly be used by adults.

22.   The nonprofit foundation did the study to find out how young adults use health care content on the Web.

23.   The rules would not affect cigar or pipe tobacco because those are mostly used by adults, officials said.

24.   The woman sitting next to me suggested that many adults could use such a refresher course.

25.   This year, adults can use them.

26.   Adults often use unreliable methods to diagnose concussions, the report says.

27.   It is no good to have adults use programs designed for children or vice versa.

28.   Sometimes, adults use children to make money for themselves.

29.   The pier juts several hundred feet into New York Harbor, and neighborhood residents say it is often used by adults to teach teens how to drive.

30.   This means that adults must simply use the fitting incandescent or the flicker-free fluorescent light.