_____ has already been pointed out , grammar is not a set of dead rules.
| A．As | B．It | C．That | D．Which |
The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun |
| C．beginning | D．begun |
“What do you think made Mary so upset?” “_______ her new bike.”
| A．As she lost | B．Lost |
| C．Losing | D．Because of losing |
“How do you deal with the disagreement between the company and the customers?” “The key ______ the problem is to meet the demand ______ by the customers.”
| A．to solving, making | B．to solving, made |
| C．to solve, making | D．to solve, made |
Finding her car stolen, _______.
| A．a policeman was asked to help |
| B．the area was searching thoroughly |
| C．it was looked for everywhere |
| D．she hurried to a policeman for help |
A cook will be immediately fired if he is found _______ in the kitchen.
| A．smoke | B．smoking |
| C．to smoke | D．smoked |