In the following passage some words have been deleted. Fill in the blanks with the help of the altematives given. Select the most appropriate option for each number.
Passage:

The last manmroths, who were very large elephant-like animals, lived as recently as 4,000 years ago. ......... (1) their well-preserved bodies can be .......... (2)frozen in the tundra of Siberia. Because ........... (3) bodies were so well protected from decay ........... (4) the permafrost, their genetic material remained intact. ........... (5) at Harvard University are researching ways to bring the marmnoth back to life.