The police were seeking more information to find out______ the rich merchant.
| A．who was it that killed | B．who it was that killed |
| C．it was who killed | D．who was it killed |
______ made the school proud was ______ more that 90% of the students had been admitted to key universities.
| A．What…because | B．What…that | C．That…what | D．That…because |
There is a new problem involved in the popularity of private cars ____________ road conditions need ____________.
| A．that; to be improved | B．which; to be improved | C．where; improving | D．when; improving |
It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．when | C．what | D．how |
Barack Obama told millions ______ him that his grandmother's influence on ______ he is and the way he views the world was significant.
| A．watch; how | B．watching; who | C．watched; where | D．to watch; what |
There is no ________ thinking more about the matter. Take it easy.
| A．point | B．fun | C．doubt | D．need |