_____ playing dumb with teachers. They know very well their students.
| A．It’s no use | B．There’s no use | C．It’s no need | D．There’s no need |
Mr.Smith was much surprised to find the watch he had had__________was nowhere to be seen.
| A．repairing | B．it repaired |
| C．repaired | D．to be repaired |
__________along the quiet road at forty miles an hour，and then an old man suddenly started to cross the road in front of me.
| A．Driving | B．I was driving |
| C．Having driven | D．When I was driving |
The policeman came up to the lonely house with the door __________，__________there for a while and then entered it.
| A．open；to stand | B．opening；stood |
| C．open；stood | D．opened；standing |
The boy often gives a satisfactory answer to the teacher’s question，__________ just a minute.
So he’s usually the teacher’s pet.
| A．thought | B．having thought |
| C．and to think | D．thinking |
A doctor can expect__________at any hour of the day or night.
| A．calling | B．to call | C．being called | D．to be called |