Read the following passage, then choose the correct answer to questions.

         Pets can improve your life The role of animals in helping people recover from a range of health and emotional problem has long been widely recognized. Now a survey (21)______ is reported in the Journal of Personality and Social Psychology appears to show that owning a pet can benefit healthy individuals, too. A number of experiments, (22)______ by two universities in the United States, indicate that pet owners are generally happier, (23)______, fitter, more confident and better able to cope with everyday issues than non – owners. The researchers discovered that individuals have just as close a relationship with the key people in their lives (24)______ they have with their pets. And although they found no (25)______ that people choose emotional relationship with pets over relationships with (26)______ people, a study of universities showed that owning a pet helped them get over the break-up of a relationship with a partner.

21. A. which       B. who         C. where         D. when

22. A. carried       B. conducted          C. governed       D. operated

23. A. healthy         B. healthier         C. more healthy       D. as healthy

24. A. because         B. because of         C. as          D. although

25. A. testimony           B. support        C. evidence        D. indication

26. A. every         B. other       C. another       D. others