There is no doubt _______ international cooperation is the key to _______ with cyber crime.
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.
A notice was ________ in order to remind the students of the changed lecture time.