It was not yet dawn ______ the boy got to the school.
| A．when | B．that | C．before | D．until |
The Voice of China has set up a big stage for young people with a talent for music, ________ some of them have stood out among others.
| A．which | B．when |
| C．who | D．where |
Williams shows some challenging means ________ diners at their mystery lunch on Sunday might eat the special dish.
| A．after which | B．in which |
| C．by which | D．for which |
That scientist ________ work is successful has been made a model worker.
| A．which | B．who |
| C．that | D．whose |
Many athletes are clear that the Olympic Games are the only time ________ they will be watched by thousands of millions.
| A．that | B．which |
| C．where | D．when |
The old man often looked back on the past days ________ he worked hard to make a living.
| A．which | B．when |
| C．where | D．that |