12. But until recently, the academic ___ gained by participating ___ sports was thought to come from the increased self-confidence, the better mood and the ability to concentrate that comes from burning off steam in exercise.
A. edge …in
B. power… in D. benefit…with
C. strength…with
13. Consequently, the brains of people who exercise may be better equipped to ___ mental challenges.
A. fight
B. tackle C. deal
D. cope
14. Inactivity may also have negative effects on mind and body___.
A. together
B. wholly
C. jointly
D. alike
15. A ___ family ___ to a husband and wife and their children.
A. nuclear …refers C. extended…refers
B. nuclear…sticks D. extended…sticks
16. In America, only in a few cases ___ more than one household live ___ one roof.
A. does …under C. do…under
B. does…within D. do…within
17. Over half of U.S. marriages now end ___ divorce.
A. with
B. in
C. to
D. /
18. They realize that problems in family life in recent years have brought ___ serious___.
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