21. Shopping online will never take______ place of shopping in stores, because many people find it ______great delight to walk around in stores.
A. /; a B. the; a C. a; the D. a; /
22. In my opinion, the answer to the question you give us doesn’t make any______.
A. meaning B. point C. sense D. idea
23. All the passengers on board were asked to remain______ when the plane was making a landing.
A. seat B. seated C. seating D. to seat
