6. Tom: "Thank you for your help." – Mary: "_______ ."
A. Never mind me B. Wish you
C. With all my heart D. It’s my pleasure
27. Her mother, ______ has been working for thirty years, is retiring next month.
A. that B. whose C. who D. whom
28. Hardly had he stepped out of the room _________ he heard a loud laughter within.
A. then B. than C. when D. Until