At the sight of her mother, the surprise on her face was ______ by joy.
| A．taken place | B．replaced |
| C．in place of | D．instead of |
The art center is ______ used to be Factory 789 and _______ millions of tractors were made.
| A．what; where | B．where; where | C．that; which | D．where; which |
____ students should be given more free time is suggested by many experts and welcomed by kids in school.
| A．What | B．Why | C．Whether | D．That |
When I try to find ______that prevent so many people from taking part in the program, it seems to me that there are two main causes.
| A．why it does | B．what it does | C．what it is | D．why it is |
— Will you go to the annual meeting to be held in Sweden from the 26-30th of August 2008?
— That depends on _______ I am invited.
| A．whether | B．if | C．whomever | D．why |
____is certain is ___prevention is more important than treatment .
| A．It;that | B．What;that | C．As;what | D．What;what |