_______ we couldn't find our way out was really bad news.
| A．That |
| B．What |
| C．Whether |
| D．Which |
There are nearly one hundred foreign students in our university, most of _______ are from America and Australia.
| A．which | B．them | C．whom | D．those |
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 |