1. The chances against this kind of unusual........ are very high ( occur)
2. I am not convinced that there's a ......... link between pollution and global warming. ( cause )
3. The........... of the cliffs by the sea has completely changed the landscape ( erode)
4. Female animals have an ........... need to protect their young ( instinct)
5. The police are investigating the ............ disappearance from the zoo of a number of animals ( mystery)
6. We knew that getting between the whale and the ship was ........., but ist was the only way to stop them hunting. ( risk)
7. What's your ........ of the situation? ( assess)
8. We have to wait for ....... conditions to launch the boat. ( favour)
9. The expedition travelled miles in search of the ............. mountain gorilla ( elude )
10. Following the ................ of the volcano, hundreds of villages were destroyed. ( erupt)
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