-When __________ Mr. Green __________ to Australia? -He traveled to Australia two years ago. A. did, travel B. did, traveled C. was, travel D was, traveled
-He __________ his mother do the housework at the age of eight. -We should help our parents with the housework. I did it when I __________ six. A. helped, was B. helps, was C. helped, am D helped, am
He __________ well in the exam last week, so he __________ hard now. A. did, studied B. didn't, is studying C. didn't do, is studying D didn't, studying