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
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
