______, so he stopped the car at once.
| A．Seeing a boy lying on the road |
| B．On seeing a boy sitting on the road |
| C．The driver had seen a boy standing on the road |
| D．The minute the driver saw a boy seated on the road |
He wrote a letter to me _______ that his trip to Japan had been put off because of the bad weather.
| A．inform | B．informing | C．informed | D．being informed |
_______ a satisfactory operation, the doctor believed the patient would recover from his illness very soon.
| A．Having been given | B．Having given | C．Giving | D．Being given |
_______ a satisfactory operation, the patient recovered from illness very quickly.
| A．Having been given | B．Having given | C．Giving | D．Being given |
.When I came in, I saw Dr. Li _______ a patient.
| A．examine | B．examining | C．to examine | D．examined |
.The cars _______ in Beijing are as good as those _______ in Shanghai.
| A．produce, produce | B．produced, produced |
| C．produced, producing | D．producing, producing |