how was your weekend? —- Great! It was my grandfather’s _______ birthday. We enjoyed ourselves.

Tom just finished ________ her homework.

The school bus picks up the students _______ the morning. [ ]

Amy, I called you yesterday evening, but nobody answered the phone.— Oh, I _________ a walk with my mother at that time.

The question is too hard to understand. —Why _______ ask the teacher? [ ]