结构推理 Many of my students have difficulty taking tests. For some, the test situation causes great stress and tension. The minds of these students "go blank" when they receive the test paper. Others do not know how to study and, thus come to the test ill-prepared to answer the questions. Some students study correctly but do not follow the directions on the test. They are usually unable to finish the exam on time. These are some of the factors that contribute to the poor performance of certain students on tests.
   The first group of students' problem on tests:
   Cause:
   ______________________________
   Effect:
   ______________________________
   The second group of students' problem on tests:
   Cause:
   ______________________________
   Effect:
   ______________________________
   The third group of students' problem on tests:
   Cause:
   ______________________________
   Effect:
   ______________________________