10) A or B and C but D so
11) A case B one C thing D practice
12) A different B another C foreign D other
13) A separate B lonely C alone D single
14) A yet B either C too D already
15) A at B to C on D from
16) A watch B see C notice D find
17) A thift B exchange C board D change
18) A where B that C when D which
19) A ended B over C completed D finished
20) A date B time C while D day
参考答案：
1--5 BACDA 6--10 CCBDA 11--15 BCCAA 16--20 DDABB
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