Ai đoá cứu mình với .cầu xin giải thích nha

C1103 Choose a, b, c, or d that best completes each unfinished sentence; or that best substitutes the underlined part. t An do 6. With a population more than one billion, China and India are the two most populous countries in the world. d. on a. of b. in c. for 7. Although your ideas a ...