(2013·高考江苏卷)Generally，students’ inner motivation with high expectations from others________essential to their development.
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A
is
B
are
C
was
D
were
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What the science teacher does and says ____ of great importance to college students.
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A
was
B
are
C
is
D
were
John,together with some of American soldiers who sent to Iraq， killed in a bomb explosion.
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A
were;were
B
was;was
C
were;was
D
was;were
As we all know, the number of Tibetan antelopes(藏羚羊) ________ becoming ___________.
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A
is; less and less
B
are; less and less
C
is; smaller and smaller
D
are; smaller and smaller