Correct Answer:
Option C - Modal verb 'I used to' will be used. 'Used to' refers to talking about something that happened in the past or existed in the past but is no longer true.
Correct Sentence
when I was in 5th grade I used to ride on my red bicycle.
C. Modal verb 'I used to' will be used. 'Used to' refers to talking about something that happened in the past or existed in the past but is no longer true.
Correct Sentence
when I was in 5th grade I used to ride on my red bicycle.