Each year more than 3 million people visit Rocky Mountain National Park, the third most-visited national park in the USA. Many of them arrive there by car, they drive along the Trail Ridge Road, which     1     (build) during the 1930s.

People are attracted by its scenery, hiking trails and wildlife. The hiking trails include    2     (challenge) difficult climbs    3     some of the high mountains and forest hikes     4    lead to one of the park’s waterfalls. They also include trails to blue lakes. The view of Longs Peak from its lakeside is the finest in the whole park. One of the most     5     (adventure) hikes in the park is the Continental Divide Loop. The 86-kilometer path cuts through valleys and past lakes and waterfalls. It takes most hikers at least six days    6     (complete).

Long hikes give visitors a chance to experience Rocky Mountain wildlife. Within the park     7     (be) hundreds of sheep as well as     8     small moose population. The park’s huge number of large animals makes     9     one of the best places in America for wildlife watching.

The     10     (explore) of the park could be enjoyable and unforgettable. You can explore it on foot, you can sleep under the stars, and you can sit by a clear quiet lake.

The Badlands National Park, one of the most popular attractions in western South Dakota, contains one of the world’s richest fossil     1    (bed). Scientists believe that 33 million years ago, a watering hole was located in the Badlands and that a drought forced mammals to travel long distances     2    (detect) water. Ancient horses, turtles, and hornless rhinos once     3     (live) here. Nowadays, the park is mainly home    4     mammals like big horn sheep, antelopes, and deer,     5    wander the 244,000 acres of the park. The park is also a reintroduction site of the endangered black-footed ferret(雪貂), one of the world’s     6    (rare) mammals.

Visitors can enjoy hiking on eight routes from 400 meters to 160 kilometers long and     7    (camp) at Cedar Pass Campground with attractive scenic views. Badlands National Park has no formal reservation system, but visitors ought to obey some rules. Firstly, apply for     8     pass ahead of time. Maps are     9    (strong) recommended and are available for purchase in the Badlands bookstore. Besides, campfires     10    (ban) under any circumstances. Finally, remember to take away all garbage, including toilet paper, and all human waste must be buried in a small hole 6 inches deep and a minimum of 200 feet from any water source.