Answer:
<em>I don't know. When I (</em><u><em>b) will arrive</em></u><em> at the station tomorrow, I (c) will look at the information screen. </em>
Explanation:
Looking at the given sentence, the words/ verbs in parenthesis are to be changed in their respective verbs as needed. Verbs can be changed to different tenses, depending on the frame of the sentence.
As we can see in the given sentence, the word "tomorrow" denotes that the action of verbs is not yet done and that it is a future event. So, the words in parenthesis will be changed in the future tense accordingly.
So, the given sentence will become-
I don't know. When I will arrive at the station tomorrow, I will look at the information screen.
