( ) (n.) the act of maintaining something in its original state or in good condition 2. ( ) (v.) to state officially that something is useful and of an acceptable standard 3. ( ) (phr.) to become completely involved in (something) 4. ( ) (adj.) very different from each other 5. ( ) (n.) an organized journey with a particular purpose 6. ( ) (v.) to make (somebody) decide to do (something) 7. ( ) (n.) data relating to populations and groups of people 8. ( ) (adj.) very attractive and interesting 9. ( ) (n.) a variety of things or experiences of a particular type 10. ( ) (adj.) belonging to a particular place, rather than coming to it from someplace else 11. ( ) (phr.) to increase knowledge of or interest in (something) 12. ( ) (adj.) connected to the relation of living things to each other and to their environment