As the train ran faster and faster，the lights of the city were soon ________.
| A．left off | B．left alone |
| C．left behind | D．left out |
How long do you think it will be ________the computer company puts forward a new product?
| A．before |
| B．since |
| C．until |
| D．that |
How long do you suppose it is ________he arrived there?
| A．when |
| B．before |
| C．after |
| D．since |
Traveling ______a speed of 160 km/h，we have covered a distance of 120 kilometers ________less than 50 minutes.
| A．with；in |
| B．at；in |
| C．with；for |
| D．at；for |
The poor little boy ________by his heartless parents was seen begging in the street.
| A．abandoning |
| B．to be abandoned |
| C．having abandoned |
| D．abandoned |
－What is the IOC?
－It's ________the International Olympic Committee.
| A．in short of |
| B．for short of |
| C．short for |
| D．short of |