12) A and B but C though D however
13) A practice B process C manner D way
14) A those B which C want D that
15) A saves B helps C serves D aids
16) A happy B fortunate C lucky D unfortunate
17) A attributed B assigned C distributed D named
18) A waiting B tried C waited D trying
19) A announced B declare C published D reported
20) A on B out C about D up
答案：
1--5 BBDBD
6--10 CABBC
11--15 BCDDB
16--20 DBAAA
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