Choose the best answer A, B, C or D to complete the sentence. 16. Spring water slowly flows through the cavern, ……………………limestone. A. forming                         B. carving                          C. eroding                          D. featuring 17. Frog legs are one of the better-known delicacies of French ……………………. A. cuisine                          B. landscape                      C. recipe                            D. ingredient 18. Saturdays are busy, so it’s a good idea to ……………………a table in advance. A. offer                              B. reserve                          C. retain                             D. save 19. Nick has just returned from his holiday looking relaxed and ……………………. A. cool                               B. worried                         C. tanned                           D. exhausted 20. The authorities are trying to encourage and ……………………domestic tourism. A. permit                           B. issue                              C. promote                        D. attract 21. Our ……………………showed us around the old town and regaled us with historical stories. A. travel agent                   B. holidaymaker               C. sightseer                       D. tour guide 22. Ha Long Bay has twice been ……………………by UNESCO as a World Natural Heritage Site. A. experienced                  B. recognized                    C. discovered                    D. developed 23. When spending a week in Berlin, you can ……………………the city itself and its surroundings. A. explore                          B. travel                            C. visit                               D. guide 24. With its ……………………climate, the country attracts both winter and summer sports enthusiasts. A. extreme                         B wet                                 C. harsh                             D. varied 25. Son Doong Cave is one of the most fascinating ……………………that can be experienced in Southeast Asia. A. journeys                        B. expeditions                   C. destinations                   D. explorations