The teacher usually (鼓励) his students to do their homework carefully.
The (seven) Big Data Expo was held successfully in Guiyang in May,2021.
Mary doesn't (real) care if her friends are the same or different.
If I'm available tomorrow afternoon,I (visit)the city museum with my brother.
We couldn't do all the work by ( us).
Look!The students (answer)the questions carefully.