21.   The seat facing mine was empty.

22.   The seat is adjustable to fit the contours of your back.

23.   The seat of awareness is a subject of philosophical speculation.

24.   The seats are firm, and the driving position offers good all-round visibility.

25.   There are more seats at the rear of the theater.

26.   There are two seats left in the back row.

27.   There were no seats, so we had to stand.

28.   There were transverse seats for two in each corner, reducing the seating by four.

29.   These seats are only for first class passengers.

30.   Those seats are more supportive than before and offer good height adjustment.