—How do the children cross the river to go to school in that small village? —They cross the river _________. 
#46108
A
on a ropeway
B
by bike
C
by the boat
D
on foot
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----Why do you always sleep ________?----Because I’m afraid of the dark. 
#47797
A
by yourself
B
with the door open
C
with the window open
D
with the light on