________ doing his experiment, he forgot to pick up his wife from the station. 
#13211
A
Absorbed in
B
Absorbed to
C
Absorbing in
D
Absorbing to
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You should study the details of the policy        before you sign it.
#11635
A
in return
B
in advance
C
at ease
D
on purpose
The police came running and       the crowd.
#13396
A
broke off
B
break into
C
broke up
D
break down