A careless joke _____ an argument between the two friends, and so far they haven’t forgiven each other.
If by any chance someone comes to see me, ask them to leave a________.
The new law would come into ___on the day it was passed.
The doctors must get there in half an hour. There should be no____ in sending the blood to the dying girl .
.Among all the problems,_______is so difficult as this one.
It was 1920 ______ regular radio broadcasts began.