Memories are made of sleep

Teenagers often choose not to spend time (12) ............ up on their sleep. However, recent studies show they
need more sleep than they realise - up to nine hours a night. There also seems to be a direct (13) ............
between sleep and academic success. Studies show that our ability to sleep is directly related to our ability to
learn, suggesting that good sleep (14) ............ are essential to good study techniques. (15) ............, it may
be useful for students to study for a test just before going to bed because sleep will help them store important
information they need to remember the next day. (16) ............, information becomes ‘cemented’ in our brains
as we sleep. However, for older people it may be more appropriate to establish a regular (17) ............ of
taking several short naps during the day. (18) ............ we all need to experience both light and (19) ............
sleep, regular napping can mean we are actually less (20) ............ to forget things.
12. A. catching               B. getting              C. taking           D. making
13. A. bond                     B. union                C. link               D. attachment
14. A. customs                B. traditions          C. habits           D. manners
15. A. Consequently        B. However          C. Eventually    D. Finally
16. A. Apparently             B. Fortunately       C. Obviously     D. Clearly
17. A. method                  B. tradition            C. order             D. routine
18. A. But                         B. Although           C. Unless          D. Providing
19. A. deep                       B. long                  C. big                D. large
20. A. possible                  B. probably           C. likely             D. usual