25. Thirty years ago this month，China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade．
| A．to open | B．opened | C．opening | D．having opened |
----- Why are they taking all the equipment away ?
------____________ , they are packing up to leave.
| A．The job was done | B．The job has been done |
| C．With the job done | D．With the job doing |
It is _____that he has been addicted to the drugs and has difficulty quitting it.
| A．obviously | B．apparently | C．possibly | D．likely |
George Washington was born in 1732 in a rich family in _______ is now the state of Virginia.
| A．which | B．where | C．that | D．what |
_____ do you think will teach us math next term？
| A．Whom | B．Who | C．What | D．That |
. The reason why I have to go is _____ if I don’t.
| A．that she will be disappointed | B．because she will be disappointed |
| C．because of her being disappointed | D．that she will be disappointing |