It is very kind _____ you to help me with my lessons. It is difficult _____me to learn them well.
#51240
A
of , of
B
for , of
C
of , for
D
for , for
推荐题目
They just talk instead of _______.
#48858
A
working
B
works
C
to work
D
work
Because it’s very hot in summer, people often sleep_____the windows____at night. 
#47690
A
with; open
B
with; opening
C
in; opening
D
in; open