—Where is Bob? I cannot find him anywhere.
—He have been off long. I heard him make a call just now.
| A．shouldn’t | B．can’t | C．mustn’t | D．needn’t |
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 |
Nearly all of the roads in this county are rough (不平坦的），__________ this one.
| A．in theory |
| B．in particular |
| C．in practice |
| D．in general |