This blue bike is too expensive. Could you show me a ______ one?

—Would you please drive ______? My train is leaving. —I’d like to, but safety comes first.

Most students think they should have ______ time and energy to develop their own interests.

—Who is          person in China?—I think Yao Ming is.

—Which city has __________ population, Shanghai, Hangzhou or Ningbo?  ----Shanghai, of course.