John does important research _______ the best ways to help the old.
#48571
A
finds
B
finds
C
found
D
to find out
推荐题目
All of us felt ______ when we saw the girl speak very good English. 
#50838
A
surprise
B
surprised
C
surprising
D
in surprise
Can I stop ______ a rest, Sir?– Keep _______! The terminal (终点) is around the corner.
#50437
A
to have, running
B
having, running 
C
to have, to run
D
having, to run
I can’t wait__________ the nice picture.
#50293
A
buy
B
to buy
C
buying
D
bought
It was stupid       __ him      __ this mistake .
#48693
A
for;to make
B
of;to make
C
for; make
D
to;to make