—I'm afraid I can't return the book to you before Friday.

—________.[ ]

A. Don't be afraid  

B. Be careful

C. Not at all  

D. Take your time

—Which city has ________ population, Shunghai, Hong Kong or Qingdao?

—Shanghai, of course. [ ]

A. the smallest

B. the least

C. the most

D. the largest