What do the words and expressions mean? Choose the correct alternative.

1. treasure
   • collection of valuable things
   • to be very certain about something

2. illegitimate
   • feeling sick
   • born of unmarried parents

3. motive
   • sudden movement
   • reason for doing something

4. stab
   • blow with a knife
   • people working at the castle

5. forensically examined
   • examined by police specialists
   • final test at the Police Academy