When asked what original intention led them to volunteer, about half of___ said they were willing to devote themselves.
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.
Such things ___ you described in the report seldom happen now.
At present, how we can look after ______ old is becoming ______ hot and severe issue.
It is the duty of the police to ______ social order.