—____ do you visit your parents?—Once a month.
A. How long
B. How soon
C. How often
D. How far
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What’s _______ with the machine?
A. trouble
B. wrong
C. ill
D. matter
I can’t walk _____.
A. much farther
B. much far
C. far
D. farther
Ability is____ than a certificate.
A. much important
B. important
C. more important
D. the most important
_______here for three years.
A. came
B. have gone
C. have been
D. was