_____ number of the students is 4,0000 , much more than last year.
I was listening to pop songs while my parents ________ dinner yesterday.
My little cousin enjoys ________ picture books before he goes to bed.
It was very late, but the teachers were ________ working hard in the office.
My teacher said to me with a smile, “Well, you ________ to worry about your lessons.”
Mr. Wang is always the first one to be in the office ________ he lives far from his company.