He __________ well in the exam last week, so he __________ hard now.A. did, studied B. didn't, is studying C. didn't do, is studyingD didn't, studying
There are forty ____ in our school.
Tigers are ____ scary, so I’m afraid of them .
--Sorry, I forget ____ my homework . --Don’t do that again.
The ____ is one of China’s ____.
Tony can play ____ chess, but he can’t play ____ violin.