It sounds _____ the singing of rails. 
#83289
A
as
B
in
C
like
D
as if
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They_____the train until it disappeared in the distance.
#78551
A
saw
B
watched
C
noticed
D
observed
 You should visit your parents _____, even when you are very busy.
#64561
A
by and by
B
more or less
C
step by step
D
now and then
 By the time I _____the railway station, the train _____. 
#74980
A
got to, left
B
reached, had left
C
arrived, had left
D
came, left