What we know about certain diseases are still not sufficient to prevent to prevent them from spreading easily among the population. 
A.What we know about
B.Are 
C.From spreading
D.Among

______(57)
A.preconception 
B.knowledge 
C.understanding 
D.feeling

______(56)
A.quantity
B. quality
C.effect 
D. product

______(55)
A.integral
B.mixed
C.fractional
D.superior

He inherited a lucrative business from his father.
A.lucid 
B.profitable
C.wealthy
D.losing

Dr.Jones suggested that final examinations should be discontinued , an innovation I heartily support.
A. Inner part 
B. test
C.change 
D.entrance

I’d rather stay in a hotel with all the amenities than camp in the woods.
A.expenses
B.friends
C. sports
D.conveniences

A domineering husband , he is the stereotype of a male chauvinist 
A.musician 
B.opposite 
C. disagreeable
D.fixed conception.

His new yacht is certainly an ostentatious display of his wealth.
A.showy
B.expensive
C. large
D.ossified

It is essential_______ 
A. For everyone who knows what to do in the event of fire. 
B.For everyone knowing what to do in the event of fire. 
C. That everyone know what to do when there is a fire.
D.That everyone to know what to do when there is a fire.