____ can be done ____ been done. 

There ________ a basketball match between Class 1 and Class 2 yesterday.

Listening to peaceful music.  as well as taking exercise,___________ a lot in relieving people 's sad emotions.

---“Each of the students, working hard at his or her lessons,_____ to go to university.” ----“So do I.”

Professor Smith，along with his assistants，       on the project day and night to meet the deadline.