Unit6 When was it invented?单元练习
一、单项选择（共15小题；共15分）
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
4. He is very surprised that all the houses in the village white.
A. paint B. painted C. are painting D. are painted
5. In the spoken English of some areas in the US, the "r" sounds at the end of the words .
A. are dropped B. drop
C. are being dropped D. have dropped
6. The 31st Olympic Games will in Brazil in 2016.