Complete the given sentence using appropriate form of verb:
I'm too tired to walk home. I think ____________ a taxi.

The sentence "I'm too tired to walk home. I think I'll get a taxi." describes a future intention or action.

The blank requires the future tense, and "I'll get" accurately conveys the idea that the speaker plans to get a taxi as a solution to being too tired to walk home.

In Option A, "I have got" (present perfect) is not suitable for describing a future action.
In Option B, "I am getting" (present continuous) is not appropriate for describing a future action.
In Option C, "I got" (past simple) is not suitable for describing a future action.

The correct answer is Option D: I'll get, which accurately conveys the future intention of getting a taxi as described in the sentence.