—Amy, I called you yesterday evening,but nobody answered the phone.—Oh, I ________ a walk with my mother at that time.
There are ______ students in this school.
—Do you enjoy _____ basketball? —Yes, I do. It’s my favorite sport.
Li Lei keeps ______ English every day.
I wanted to be _____ actor when I was a child.
What’s wrong with you , Maria?