Complete the sentences with the given words in the correct form

• revive
• excavate
• preserve
• roam
• clone

1. DNA samples can be [ ]
   in a freezer.
2. Scientists believe they will be able to [ ]
   extinct animals in the future.
3. Archaeologists are very careful when they [ ]
   artefacts from a site.
4. Dinosaurs [ ]
   the Earth over 65 million years ago.
5. Scientists have already [ ]
   one sheep from another.