1. A strong enthusiasm or interest in smth. - PASSION/THIRST
2. A modal verb that is a synonym for the more formal 'ought to'. - SHOULD
3. An organisation for people who have a common interest in a particular activity or subject. - CLUB
4. The process of improving the quality or power of smth by adding smth else. - ENRICHMENT
5. This verb can function as a main verb as well as a modal one (only in negative and interrogative sentences). It means that smb or smth wants smth else. - NEED
6. This adjective means that smth doesn't refer to the usual school course. - EXTRACURRICULAR/OPTIONAL
7. A range of different things of the same type. -SET