—_____ do you go to the cinema?   — Once a month.
#35565
A
How soon
B
How long
C
How often
D
How far
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The cleaners must prevent the street _____.
#38226
A
from getting dirty
B
to dirty
C
to get dirty
D
getting dirty
They took rock samples back to Earth for _____study.
#42229
A
farther
B
step by step
C
further
D
far away