—____ you ever _____ Han Hong sing live?
—Of course. A couple of times in different cities.
A. Have; seen B. Did; see C. Do; see
—Look at the sign on the right.
—Oh，parking _____ here.
A. doesn't allow B. isn't allowed C. wasn't allowed
—I tried to make Alice _____ her mind but I found it difficult.
—Well, I saw you _____ that when I went past.
A. changed; do B. changes; doing C. change; doing
_____ information he offered us! We all thank him.
A. What useful B. What useless C. How useful
—Shall we go now?
—No, let's wait ____ the rain stops.
A. until B. when C. if
—Food safety has become a social focus now.
—That's why laws are made _____ crimes on food.
A. to record B. to prevent C. prevent
