Question

 I work as a teacher and my wife ………, too.

Answer 1

I work as a teacher and my wife is teacher too

Answer 2

I work as a teacher and my wife also too.

Detailed answer

Also is the most appropriate word to be used in the particular sentence or at the moment.

• The word at makes the sentence a grammatically appropriate sentence that conveys special meaning to the sentence.
• The sentence now conveys that both the husband and wife are teachers.
• The word also is usually used to define "in addition to" that is having 2 things.
• The sentence might be any incorrect or grammatically incorrect sentence if we had used any other word.