A Trip Along the Three Gorges
15. a. with b. for c. to d. great to
16. a. careful b. sitting c. quiet d. seated
17. a. up at b. over c. around d. through
18. a. story b. relaxed c. disappointed d. puzzled
19. a. mind b. classroom c. memory d. heart
20. a. strange b. sweet c. unforgettable d. forever