9. They walk to work every day.
A. How they to work every day?
B. How do they to work every day?
C. How do they go to work every day?
D. How do they walk to work every day.
10. He opened the door last night.
A. The door opened last night.
B. The door was opened last night.
C. The door is opened last night.
D. The door wasn’t opened last night.