Air, food and water are______ to human beings.
A.unquestionable
B.indispensable
C.undeniable
D.indebted

It is illegal to______ on grounds of race, sex, or religion.
A.discriminate
B.differentiate
C.certify
D.differ

Crops are often completely destroyed by ______of locusts.
A.bands
B.troupes
C.swarms
D.flocks

It is _______that I can’t put it down.
A.so interesting a book
B.so interesting book
C.such interesting book
D.too interesting book

Because it was so closely related to communication,______ art form to develop.
A.drawing was probably the earliest
B.to draw early was probably
C.early drawing probably
D.the earliest drawing

She failed the test______ she studied hard.
A.although
B.despite the fact that
C.as
D.A and B are correct

_______, Nam Cao was a realistic writer, but he still used a lot of romance in his stones.
A.On the contrary
B.On my part
C.On the whole
D.On the other hand

Neither Canada nor Mexico______ that citizens of the United States have passports when they want to visit these countries.
A.to require
B.require
C.requires
D.requiring

He has always insisted on his________ Dr. Turner instead of Mr. Turner.
A.been calling
B.called
C.having called
D.being called

Were she ten years younger, she ______to dance.
A.will learn
B.had learned
C.would learn
D.would have learned