---Why are you looking so disappointed , Ken? ---The outdoor concert _____ for tomorrow will be put off.
The key _________ the string was put into the door to stop the kite _________.
_________ that he had fallen behind,he tried to work harder.
Plastic and rubber won't _________ electricity,but copper will.
____no need for us to discuss the problem again since it has already been solved.
I didn't like aunt Lucy,who __________ without warning and bringing us presents.