was talking with my monitor when a fight ________between the students of the two classes.[ ]

ing to the new rules, if a student ________ happen to damage something in the campus, he/she should report it those concerned immediately.

_________ scientist Tu Youyou won the Nobel Prize for medicine (诺贝尔医学奖)_________ October 5, 2015.

Don’t shout at him. He _______.

The school was moved out of downtown as thenumber of students had grown too________．