In the past few years, My Heart Will Go On was a popular song among young people, ____ were often heard singing it at parties．
| A．they | B． that | C． who | D．which |
On hearing a great noise, Mike looked forward through the window _____
what happened outside the room.
| A．to seeing | B．to see | C．seeing | D．to have seen |
We hadn't met for 20 years, but I recognized her_____ I saw her.
| A．the moment | B．for the moment |
| C．the moment when | D．at the moment when |
There were many more people who got injured in the big fire than _______.
| A．was reported | B．it was reported |
| C．were reported | D．they were reported |
This robot is supposed to save a lot of labor, but it remains a problem
if it ______.
| A．is | B．saves | C．does | D．has |
George applied for the position three times ______ he finally got it.
| A．before | B．until | C．when | D．after |