The preposition to refers to a place, direction, or position. To is also used before the verb in an infinitive. The adverb too means "also" or "excessively."
Examples:
Meg was too tired to walk home. I was tired, too. We walked to a phone booth and called a cab.
Practice:
(a) I have wanted _____ visit Boise for years.
(b) I have always been _____ busy _____ go.
(c) Next week I am driving _____ Boise, and you may come _____.
