Complete the sentences. Circle the correct words.
a. Did he (used to / use to) have a large collection of comics?
b. Although we were in the same class, I never (used to / use to) hang out with Mai.
c. Snacks (use to / didn’t use to) be so expensive when I was a child.
d. When I was a high school student, I didn’t (used to / use to) have time for outdoor activities.
e. When I was a child, I (used to / didn’t use to) read science books, but now I read them in most of my free time.