This is the second time I _______ the Himalayas as a college student.
| A．climb | B．had climbed | C．climbed | D．have climbed |
The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.
| A．make | B．had made | C．made | D．have made |
The students expected there ____more reviewing classes before the final exams.
| A．to be | B．are | C．being | D．is |
Such things ___ you described in the report seldom happen now.
| A．that | B．who | C．as | D．which |
At present, how we can look after ______ old is becoming ______ hot and severe issue.
| A．the, a | B．a, the | C．a, a | D．the, the |
It is the duty of the police to ______ social order.
| A．deserve | B．reserve | C．preserve | D．conserve |