In many ways, riding on a bike is simliar to ___.
| A．driving a car | B．when you drive a car | C．drive a car | D．when driving a car |
She showed the visitors around the museum, the construction _____ had taken more than three years.
| A．for which | B．with which | C．of which | D．to which |
It suddenly occurred to him _____ he had left his keys in the office.
| A．whether | B．where | C．which | D．that |
New technologies have made ______ possible to turn out new products faster and at a lower cost.
| A．that | B．this | C．one | D．it |
Building a new school is one thing, while keeping it running smoothly is quite_______.
| A．the other | B．another | C．neither | D．others |
China has been pushing the reform of public hospitals ______ all its citizens.
| A．in charge of | B．for the purpose of |
| C．in honor of | D．for the benefit of |