Two fifths of the police _____ in the school near the town.
| A．has trained | B．have trained | C．has been trained | D．have been trained |
When you’re learning to drive, _______ a good teacher makes a big difference.
| A．have | B．having |
| C．and have | D．and having |
“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 |
The boy wanted to ride his bicycle in the street, but his mother told him _______.
| A．not to | B．not to do |
| C．not do it | D．do not do |