_________ we have been classmates for three years, she hasn’t left me much impression, so I can’t remember her after graduation.
He is too careless and he _______ keys.
Please write your composition ________ line to leave space for the teacher’s correction .
_______ are the days when the teachers were looked down upon .
Mr. Wang was such a good teacher _______ the students love and respect.
Until the present century, ________ demand for natural gas.