6. John is collaborating with Mary in writing an article.
A.cooperating
B.competing
C.combining
D.arguing
7. He isdetermined to consolidate his power.
A.strengthen
B.control
C.abandon
D.exercise
8. Manyscientists have been probing psycholog ical problems.
A.solving
B.exploring
C.settling
D.handling
9. Hearingproblems may be alleviated by changes in diet and exercisehabits.
A.removed
B.cured
C.worsened
D.relieved
10. And thecars are tested for defects before leaving thefactory.
A.functions
C.motions
B.faults
D.parts
