Your attention should be focused ______ your homework rather than TV programs. 
#25778
A
on
B
into
C
to
D
for
推荐题目
__________,  he caught up with others.
#25996
A
With the help of the teacher’s
B
With the teacher’s help
C
By the teacher’s help
D
On the teacher’s help
The official made the demand that the soldiers ____ at once _____ battlefront. 
#26093
A
leave; for
B
to leave; to
C
left; to
D
to be left; for