21. — A second，please. I have another call coming through.
— ______ . I’m not in a hurry.
A. Enjoy yourself B. Leave me alone C. Do as you like D. Take your time
22. December 21st of 2012 is a special day，______ people all over the world will remember forever.
A. it B. one C. this D. that
23. Mr. Smith is a teacher with rich teaching experience，from ______ much can be learned.
A. whom B. which C. where D. that
