I must apologize for __________ ahead of time.
| A．letting you not know | B．not letting you know |
| C．letting you know not | D．letting not you know |
She offered me practical __________ with my research, for which I would appreciate for my whole life.
| A．conduct |
| B．certificate |
| C．admiration |
| D．assistance |
You can never imagine what great difficulty I had __________ the poor boy who was trapped in the earthquake.
| A．helping |
| B．to help |
| C．help |
| D．helped |
Tom's father doesn't __________ of him joining the army.
| A．allow |
| B．agree |
| C．approve |
| D．let |
Despite other scientists' __________ of interest, Fleming kept trying to develop the chemical __________ it would be safe and effective.
| A．lack； so as to |
| B．lacking； so as to |
| C．lack； so that |
| D．to lack； so that |
All parts of the house __________ one of the windows were still in good condition.
| A．other than |
| B．rather than |
| C．less than |
| D．more than |