One of my friends (plant, plants) vegetables in her back garden.

plants

No one ever (believes, believe) what I say.

believes

All of my classmates (do, does) their homework.

does

No one in my family ever (complain, complains).

complains

The moon in the night sky (is, are) a beautiful sight.

is

The marching band (play, plays) at every football game.

plays

The boss (wants, want) to hire a new employee.

wants

Mumps (is, are) a contagious disease.

is