You should clean this room every day.

A. A lot of people were injured in the earthquake.

B. A lot of people were injured on the earthquake.

C. A lot of people were injured at the earthquake.

D. A lot of people were injured for the earthquake.

A. I’m calling the travel agent now.

B. I calling the travel agent now.

C. I call the travel agent now.

D. I’m call the travel agent now.

A. You shouldn’t turn off the lights before going out.

B. Turning off the lights before you go out isn’t permitted.

C. You should turn off the lights before going out.

D. You have turn off the lights when you go out.

A. If there is a fire in your house, to call 114.

B. If there is a fire in your house, calling 114.

C. If there be a fire in your house, call 114.

D. If there is a fire in your house, call 114.

A. The volcanic eruption was so destructive that many lives were threatened.

B. The volcanic eruption is so destructive that many lives are threatened.

C. The volcanic eruption be so destructive that many lives are threatened.

D. The volcanic eruption be so destructive that many lives were threatened.

A. I couldn’t see more a few feet in front of me because of the snow.

B. I couldn’t see more a few feet in front of me because the snow.

C. I couldn’t see more than a few feet in front of me because the snow.

D. I couldn’t see more than a few feet in front of me because of the snow.

A. What would you do if there is a tornado in your area?

B. What would you do if there will be a tornado in your area?

C. What would you do if there were a tornado in your area?

D. What would you do if there has been a tornado in your area?