The research is so designed that once _____ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
—It has been a wonderful evening. Thank you very much.
—__________.
| A．I’m glad to heart that. | B．My pleasure |
| C．No, thanks | D．Don’t say so |
Many towns and villages had their water supply ________ because there was no electricity.
| A．cut through | B．cut off | C．cut up | D．cut down |
The keythe earth is to change the waywe live.
| A．to save; / | B．to saving; / |
| C．to save; how | D．to saving; how |
There are over 100 night clubs in the city, but you don’t often seethat is empty.
| A．one | B．the one | C．it | D．that |
It is _____ we do ---- you and I ____ changes the world.
| A．that; that | B．that; what | C．what; that | D．what; what |