After several days of social activities, I decided to       _ on my research on the human behaviors. 
#72745
A
fix
B
settle
C
set
D
concentrate
推荐题目
After he graduated from college, he _______ his father’s business.
#65197
A
took in
B
took up
C
took over
D
took on
 --- Have we ______ water?--- Yes, _____. We’d better get some.
#68764
A
run out of; we have run it out
B
run out of; our water has run out
C
run out of; our water has been run out
D
run out; our water has been run out.
The host country_____ vast facilities,_____ a stadium,swimming pools and living quarters.
#83748
A
offers ;containing
B
gives; included
C
awards; contained
D
provides; including