1 feel that one of my main duties ______ a teacher is to help the students to become better learners. 
#4903
A
for
B
by
C
as
D
with
推荐题目
The chief________of the year 2010 for Shanghai will be the Expo.
#4788
A
incident
B
event
C
affair
D
accident
It is illegal for a public official to ask people for money ____ favors to them.
#4649
A
in preference to
B
in place of
C
in agreement with
D
in exchange for
Luckily, Smith brought a map, __________ we would have got lost.
#4527
A
that
B
of which
C
without which
D
which
If you keep_____,you can sit on _____side of the boat.
#4670
A
quite,either
B
still,either
C
calm,each
D
silent,both