题目内容：
Questions 17-20• Using the information in the text, complete each sentence 17-20 with a phrase A-G from the list below.
• For each question 17-20, mark one letter (A-G) on your Answer Sheet.
• Do not use any letter more than once. 17 Most people agree that the recent increase in stress is due to changes in ____________.
18 The trainees are taught that the right level of stress at work is important for good.
19 Trainees learn that one way of limiting stress is by deciding upon.
20 One of the most important parts of the course is learning how to react to___
A levels of performance
B shorter deadlines
C employment practices
D higher levels of sickness
E unfair demands
F successful management structure
G practical targets
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