The element radium, ______ in the chemistry lab, gave off a blue light.
| A．discovering | B．to be discovered | C．to discover | D．discovered |
I wonder why he didn’t do it as ______.
| A．told him | B．he told | C．telling to | D．told to |
The water companies were instructed to keep the people ______ to the polluted water.
| A．from exposing | B．being exposed | C．exposing | D．from being exposed |
The old teacher lay wide awake on his bed, ___________ all the problems he had to deal with the next day.
| A．thought about | B．to think about | C．thinking about | D．having thought about |
Anyone ________ bags, boxes, or whatever, was stopped by the police．
| A．seen carry | B．seen carrying | C．saw to carry | D．saw carrying |
---The last one ______ pays the bill.
--- Agreed.
| A．arrived | B．arrives | C．arriving | D．to arrive |
Have you checked all the CDs _______ to the mountainous area next week?
| A．sent | B．to be sent | C．sending | D．being sent |
_______ to the sunlight for too long will do harm to your skin.
| A．Exposing | B．Exposed | C．Being exposed | D．Having exposed |
I wanted _______ you for your last letter.
| A．thanking | B．to thank | C．thank to | D．being thank |
We’re looking forward __________ the photo exhibition.
| A．to visiting | B．to visit | C．to having visited | D．visiting |
________ to overcome the difficulty，he works day and night．
| A．Determined | B．Determining |
| C．To determine | D．To be determined |
He is always _______ not to do that；but he still goes on doing it all the same．
| A．telling | B．being told | C．told | D．to tell |
Her ________ smile suggested that she was very _______ with the answer-
| A．satisfying；satisfied | B．satisfied；satisfying |
| C．satisfied ： satisfied | D．satisfying；satisfying |
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