Exercise 1:

1. A. took
   (The correct form is "took" as it fits with the past tense of the sentence.)

2. D. bad-tempered
   (The passage talks about stress, so "bad-tempered" is the best option.)

3. D. to
   (The phrase "cause one to" is grammatically correct in this context.)

4. C. gone
   (The correct expression is "have gone through," referring to experiencing stress.)

5. B. In addition
   ("In addition" is the correct transition phrase to add more information to the statement.)

Second Passage:

1. C. stressed
   (The passage refers to how teenagers "feel stressed" at times, so "stressed" is correct.)

2. A. cope
   (Teenagers have to "cope with" their troubles, making "cope" the correct choice.)

3. D. psychologists
   ("Psychologists" is the correct term for professionals who give advice on stress reduction.)

4. C. unhealthy
   (Unhealthy food is the opposite of healthy food, and it's important to avoid unhealthy food when dealing with stress.)

5. B. spending
   (The correct phrase is "spending time," without "to.")