Fill in: revive, excavate, preserve, roam, clone in the correct form.

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 milion years ago.
5. Scientists have already .............. sheep from another.