China is a ____ country.
A. developing
B. develop
C. developed
D. being developed
Things keep ____.
A. changed
B. changing
C. being changed
D. change
Poor Bill can’t help ____.
A. coughing
B. to cough
C. that he coughed
D. cough
She enjoys ____ to light music.
A. on listen
B. to listening
C. listening
D. listened