he action of forming or process of being formed.

"the formation of the Great Rift Valley"

bring the different elements of (a complex activity or organization) into a relationship that will ensure efficiency or harmony.

be a member or part of (a particular group, organization, or class).

the person who leads or commands a group, organization, or country.

suppose to be the case, without proof.

a general agreement.

I admit that I made a lot of grammatical mistakes. I _____________ that I need to review my grammar rules

I ____________ to play basketball than to play basketball

done by people acting as a group.

Being efficient means the system uses inputs in a `right' way.

seasonal movement of animals from one region to another.