1. --- Do you know Earth Day?
--- Sure. It in 1970 to tell us to protect our planet.
A. sets up B. set up C. is set up D. was set up
2. --- Can you sing the English song?
--- Yes, a little. It on the radio yesterday.
A. taught B. is taught C. was taught
3. Many houses by the earthquake and thousands of people were left homeless.
A. damaged B. were damaged C. were damaging D. are damaged
