Most，but not all，insomnia is thought to __12__other health problems，from arthritis and depression to cardiovascular disease. The question often is whether the insomnia came first or was a result of the other diseases and how trouble sleeping in__13__complicates those other problems. Other diseases __14__，the risk of insomnia seems to increase with age and to be more __15__among women，especially after their 50s. Smoking，caffeine and numerous __16__drugs also affect sleep.
    
    The NIH is spending about $200 million this year on sleep-related research，some__17__to specific disorders and others __18__the underlying scientific laws that control the nervous system of sleep. The agency was__19__the panel‘s review before deciding what additional work should be__20__ at insomnia.
    
    1. [A] unproven [B] unknown [C] improper [D] imperative
    
    2. [A] fall [B] lie [C] seem [D] become
    
    3. [A] prescribe [B] pop [C] abuse [D] experiment
    
    4. [A] And [B] Though [C] Thus [D] But
    
    5. [A] peculiar [B] anonymous [C] mysterious [D] unexpected
    
    6. [A] signals [B] symptoms [C] signs [D] symbols
    
    7. [A] in addition to[B] except for [C] owing to [D] for all
    
    8. [A] pulled [B] collected [C] brought [D] drawn
    
    9. [A] on [B] for [C] up [D] in

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