—Who should be responsible for the accident?
—The boss, not the workers. They just carry the orders _______.
| A．as told | B．as are told |
| C．as telling | D．as they told |
We have just heard a warning on the radio _____________ a typhoon may be on its way．
| A．what | B．when |
| C．which | D．that |
___________ we can have clean drinking water lies in ___________ effective measures will be taken by the government about water pollution.
| A．Whether；that | B．If；that |
| C．Whether；what | D．If；what |
Love is_____ makes you smile when you are tired.
| A．that | B．what |
| C．it | D．which |
It is difficult for us to imagine_____ life was like for slaves in the ancient world.
| A．where | B．what |
| C．which | D．why |
I now, we have raised 50.000 pounds for the poor children, ______ is quite unexpected.
| A．that | B．which |
| C．who | D．it |