[填空题]If I should fail, I (try) ______ again.

[填空题]If I should fail, I (try)______again.

[单项选择]（　） I should fail again, I will not give up the experiment.
A. Even so
B. Although
C. Even if
D. Though

[填空题]If the measure of vaccine should fail, the only backup would be ______.

[单项选择]We won’t give ______ even if we should fail ten times.
[A] in [B] up [C] away [D] off

[单项选择]We won’t give up ______ we should fail ten times.
A. even if
B. since
C. whether
D. until

[填空题]Even if you should fail to persuade him，______________________________(也不要失望)．

[单项选择]（　）you decide to take up, you should try to make it a success.
A. If only
B. Unless
C. Wherever
D. Whatever

[填空题] "Humans should not try to avoid stress any more than they would shun food, love or (36)________," said Dr. Hans Selye, the first physician to (37)________the effects of stress on the body. While here’’s no question that continuous stress is (38)________, several studies suggest that (39)________situations in which you’’re able to rise to the occasion can be good for you. In a 2001 study of 158 hospital nurses, those who faced (40)________work demands but coped with the challenge were more likely to say they were in good (41)________than those who felt they couldn’’t get the job done. Stress that you can manage may also (42)________immune function. In a study at the Academic Center for Dentistry in Amsterdam, researchers put (43)________through two stressful experiences. (44)________________. In the second, they weren’’t in control: They had to sit through a bloody video on surgical procedures. Those who did go on the memory test had an increase in levels of immunoglobulin