I thought Jim would say something about his school report, but he ______ it.
Among so many people at the party, I _______ John, one of my classmates after 20 years.
He was about to leave the office for home _______someone knocked the door and asked for some help.
There are nearly one hundred foreign students in our university, most of _______ are from America and Australia.
The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.
The students expected there ____more reviewing classes before the final exams.