Energy efficiency is one of the top_____in Dockside Green, one of the eco-communities.
| A．privileges | B．priorities |
| C．possibilities | D．preferences |
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 |
It was 1920 ______ regular radio broadcasts began.
| A．while | B．when | C．that | D．since |
_____ is reported in the newspaper that talks between the two countries are making progress.
| A．Which | B．As | C．That | D．It |
Have you any knives？ I need a sharp ________.
| A．it | B．another | C． one | D．any |