In a natural disaster, minutes and even seconds of warning can make the         between life and death.
#71011
A
division
B
difference
C
separation
D
sense
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He __________ his aunt’s when he went to Wuhan on business. 
#72925
A
called on
B
called at
C
dropped in on
D
dropped in
The number of  the students in our school ________ about 3000 and ______ them study hard.
#67936
A
is, a large amount of
B
are, a number of
C
are, large amount of
D
is, a large number of
This test ____ a number of multiple-choice questions.
#70325
A
makes up
B
consist of
C
makes up of
D
consists of