21.   You waited at the entrance to Terminal One, saw me arrive in a taxi.

22.   Zach waited at the foot of the ladder while Sam climbed up.

23.   I was waiting at the bus stop.

24.   They waited at a bus stop.

25.   I waited at the top of the stairs.

26.   Each student is expected to wait at table for one week each semester.

27.   He was waiting at the door with an anxious expression on his face.

28.   He waited at the foot of the stairs.

29.   I waited at the landing for the ferry.

30.   They waited at the train station together.