23. So quickly ____________ is a possibility today may be a reality tomorrow.
| A．are science and teachnology advancing that |
| B．science and technology advancing are that |
| C．are science and technology advancing that what |
| D．science and technology advancing what that |
I have an appointment________Dr.Smith，but I need to change it.
| A．to | B．off |
| C．with | D．from |
A serious study of physics is impossible________some knowledge of mathematics.
| A．against | B．before |
| C．beyond | D．without |
It was a real race________time to get the project done.Luckily，we made it.
| A．over | B．by |
| C．for | D．against |
Let those in need________that we will go all out to help them.
| A．to understand | B．understand |
| C．understanding | D．understood |
Shortly after suffering from a massive earthquake and ________to ruins，the city took on a new look.
| A．reducing | B．reduced |
| C．being reduced | D．having reduced |