—The air in Nanjing was much better during the Spring Festival because people were not allowed to let off firecrackers.—I agree. Everyone should do what he can the environment.
–I always make mistakes in my math exams. What should I do? –I think you should be _________.
My car went ______ fast and narrowly missed _______ another car.
--What did the teacher say just now? --- The teacher told us _______ our hands before ______ the questions.
Bob told me he ______ to see his grandma _______.
Yesterday when I _______ to the station, the train ______ already.