Roots: one, two , three, four

control by one person or one company

(a)  

to make one; become a unit

(a)  

to cut into two pieces

(a)  

a set of three stories that are related by characters and plot

(a)  

a geometric figure with four angles

(a)  

The (a)   were born on February 3, 2013. That means all three of them turned ten years old today.

Jeff, John, and Susan signed up to compete in the (a)   . Susan volunteered to do the swimming event.

Sue earned $5 on Monday by shoveling snow for her neighbor. She did such a good job that she (a)   her money on Tuesday by shoveling 4 more neighbors' driveways.

He often day dreamed in class wondering if the one-horned mythological (a)   was a real creature.

The training airplane had (a)   controls. One steering wheel for the trainer and one steering wheel for the trainee.