Tomorrow night when we take the ghost tour of the city, i in my boots, hoping we don’t actually see anything too spooky! which verb or verb phrase is in the correct tense to complete the sentence?
a. quake
b. quaking
c. have quaked
d. will be quaking

The correct answer is D. will be quaking.

You need to use the future tense of the verb because the sentence is talking about the events which will take place in the future. This didn't happen yet (it is about to happen the following day), which is why D is the correct answer.
A is not correct because it is present tense; B is incorrect because something is missing; C is incorrect because that would mean she already began quaking. 

Walked would be the participle here. as it is a verb ending in -ed.