_________ that he had fallen behind,he tried to work harder.
A.Having realized B.Realized
C.Realize D.To realize
Plastic and rubber won't _________ electricity,but copper will.
A.have B.do
C.pass D.conduct
________ no need for everybody to discuss the problem again since it has already been solved.
A.It has B.There has C.We have D.There is
I didn't like aunt Lucy,who __________ without warning and bringing us presents.
A.always turned up
B.has always turned up
C.had always turned up
D.was always turning up
You'd better get all the work _________ before you leave.
A.finishing B.to finish
C.finished D.be finished
At midnight the enemy attacked _________.
A.without warning B.without notice
C.without permission D.A or B
