After a long day of hard work, my only     is to get back home and have a good sleep. 
#5112
A
concern
B
ambition
C
reward
D
burden
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She is in a poor       of health, which worries her mother much.
#7492
A
position
B
situation
C
state
D
condition
Biology is _____.
#6717
A
science of life
B
science of the life
C
the science of the life
D
the science of life