Venice (威尼斯)is famous 【小题1】 its beautiful buildings and waterways, but the 1,600-year-old city is in danger because of rising sea level. In the past 20 years, Venice has experienced 163 big floods. Strong underwater walls and gates 【小题2】 (build) to protect the city since 2009. However, for people 【小题3】 live in Venice, there are still floods and this blocks business. A shop owner there said in an interview, “Venice lives thanks to its tourism and it is our duty 【小题4】 ( save) it.”

Peru is a country on the Pacific coast of South America【小题1】three main parts: narrow, dry, flat land running along the coast, the Andes Mountains, and the Amazon rainforest.

Spanish is the main official language of Peru【小题2】(rule) by Spain from the 16th century to 1821. But before that, Peru was the centre of the ancient Inca Empire, and its emperor【小题3】(live) in what is now known as the site Machu Picchu.

Peru is an【小题4】(amaze) destination for tourists. Here【小题5】(be) two magical tours：Amazon Rainforest Tour and Machu Picchu Tour. In Amazon Rainforest Tour, you can first take【小题6】short flight into the Amazon rainforest and then travel for a day to your【小题7】(accommodate) by boat. In the following three days, you can explore the unique rainforest with a local guide. In the other tour, you can take a four-day hike through the Andes Mountains to the city of Machu Picchu. After【小题8】(explore) the ancient city, you will find it very amazing,【小题9】(especial) the Incas’ dry stone method of building. Inca builders cut stones so exactly【小题10】nothing was needed to hold walls together.

Cave tours are one of the main attractions of Mammoth Cave National Park, allowing visitors to explore the park’s extensive underground cave system. There are several different types of tours available, ranging from beginner-friendly walks 【小题1】 physically demanding adventures.

The most popular tour is the “Historic Tour”, 【小题2】 is a 2-hour walk that takes visitors through the park’s most famous caves and tunnels. This tour 【小题3】 (offer) a glimpse into the rich cultural history of the cave, including its use by early 【小题4】 (settle) and its role as a source of saltpeter during the war of 1812.

For those looking for a more challenging experience, the ”Wild Cave Tour“ is a 6-hour adventure that takes visitors off the 【小题5】 (beat) path and into some of the park’s less-explored areas. This tour involves 【小题6】 (climb) through narrow passages, and is recommended for experienced cavers and those in good physical condition.

In addition to the 【小题7】 (tour) mentioned above, there are several other options, including a “Domes and Dripstones” tour, which shows the cave’s unique geology, 【小题8】 a “Frozen Niagara” tour, which features a splendid display of frozen waterfalls and towering stalactites (钟乳石).

No matter 【小题9】 your choice is, it is definitely a unique and unforgettable experience to visit Mammoth Cave National Park. The 【小题10】 (world) most fascinating underground landscapes will never fail you.