6.John is collaboration with Mary in writing an article.
A cooperating
B marrying
C combining
D arguing
7.He will consolidate his power.
A strengthen
B win
C abandon
D unite
8.Many scientists have been probing psychological problems
A solving
B exploring
C settling
D handling
9.Hearing problems may be alleviated by changes in diet and exercise habits.
A removed
B cured
C treated
D lessened
10.The conclusion can be deduced from the premises.
A gone
B derived
C done
D come