____ horse is ___ useful animal.
| A．A, an | B．The, the | C．A, the | D．The, a |
My parents always let me have my own ____of living.
| A．manner | B．method | C．way | D．fashion |
If by any chance someone comes to see me, ask them to leave a________.
| A．message | B．letter | C．sentence | D．notice |
The new law would come into ___on the day it was passed.
| A．effect | B．use | C．service | D．existence |
The doctors must get there in half an hour. There should be no____ in sending the blood to the dying girl .
| A．delay | B．wait | C．time | D．hurry |
.Among all the problems,_______is so difficult as this one.
| A．not one | B．either | C．neither | D．none |