You will be late________you leave immediately.
Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.
I will never forget the day _____ we spend together.
----Where shall we go first?---- According to ____ schedule of the journey, firstly, we’ll visit ____ temple, the guide told us.
As a student, you should try to ______ being late for your class.
This is ______ difficult problem that few students can work it out.