11) A frequently B incidentally C deliberately D eventually

　　12) A soon B quickly C immediately D first

　　13) A some B others C several D few

　　14) A might B should C would D will

　　15) A adopting B conducting C receiving D adjusting

　　16) A to B at C on D about

　　17) A opaque B secret C sealed D hidden

　　18) A tackle B learn C study D manipulate

　　19) A in B through C with D under

　　20) A except B nor C or D but

　　1--5 CBADB

　　6--10BBDCC

　　11--15ADABA

　　16--20ADCCD