---Everyone was at the party except you. What happened?
---I after Mike, my pet dog, at home. He was ill.
| A．have looked | B．was looking | C．would look | D．had looked |
It was not until dark _____he found _____he thought was the correct way to solve the problem.
| A．that; what | B．that ;that | C．when; that | D．when ;what |
Great changes have taken place in that school, it is no longer ________ it was 20 years ago, ________ it was so poorly equipped.
| A．what; when | B．that; which | C．what; which | D．which; that |
The way he did it was different ______we were used to .
| A．in which | B．in what | C．from what | D．from which |
Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |
The place _______ the bridge is supposed to be built should be________the cross-river traffic is the heaviest.
| A．which; where | B．at which; which | C．at which; where | D．which; in which |