Choose the correct answer A, B, C or D to complete the passage

Choose the correct answer A,B,C or D to complete the passage
Yellowtone National Park , thể first US national park, (19) ...........is one of the largest parks. It covers about 3,500 square miles (20) ......... established in 1872. It's 9,063 square kilometers in north --west Wyoming and parts of Idaho and Montana.It has many wild animals,(21)..........bears, buffalo, elk, deer, antelope, coyote, and is famous for its fine scenery, hot spring and geysers ( underground hot spring that shoot hot water or steam up into the air). (22)........... are about seventy geysers in the park. The famous is old Faithful. The park is a popular tourist attractions. It has about million Visitors a year. It was (23).............a World Heritage Site in 1978.b
19 . A. Is          B. Was.          C. Has been.    D. Has.  

20.  A. Or.         B. And.          C. But.                D. So.  
21.  A. Calling. B. Including.  CAdding.         D. Consiting.
22.   A. These.  B. It.    C. There.     D. They. 
23.  A. Called.    B. Opened.   C. Made.   D. Formed.