21. She felt an insect —– around.
A. to fly
B. to be flying
C. flying
D. fly
23. It is a common sight to see youngsters —– Junk food.
A. eat
B. to eat
C. eating
D. is eating
24. She servant afraid of —– the master.
A. disobey
B. disobeyed
C. disobeying
D. be disobeying
25. —– to many places enriches our knowledge.
A. travel
B. to travel
C. travelled
D. travelling
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