All that you said _____ true. All _____ reading their textbooks when the teacher entered.
All that you said \_\_\_\__ true. All \_\_\_\__ reading their textbooks when the teacher entered.
teacher
The children _____ happily in the classroom when the teacher came in.
The children \_\_\_\__ happily in the classroom when the teacher came in.
The teacher wrote his _____ in the margin of the composition.
The teacher wrote his \_\_\_\__ in the margin of the composition.
对于学生--选课--课程的三个关系：S(S#,SNAME,SEX,AGE)SC(S#,C#,GRADE)C(C#,CNAME,TEACHER)为了提高查询速度，对SC表创建唯一索引，应建___个组上。
对于学生--选课--课程的三个关系：S(S#,SNAME,SEX,AGE)SC(S#,C#,GRADE)C(C#,CNAME,TEACHER)为了提高查询速度，对SC表创建唯一索引，应建___个组上。A
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