I heard him _______ the piano in the next room at 10:00 last night.
______ people are at the train station during the Spring Festival.
I’m afraid I _____ a little late for the class.
---Can you understand me ?---Sorry, I can _______ understand you .
_______ she studies hard, ________ the girl still can’t get good grades.
----_______ do you play with your old classmates?--- Not very often.