—Oh,it’s you!I didn’t________ you.—We haven’t seen each other for several years.Glad to meet you again.
_________ that he had fallen behind,he tried to work harder.
Plastic and rubber won’t _________ electricity,but copper will.
________ no need for everybody to discuss the problem again since it has already been solved.
I didn't like aunt Lucy,who __________ without warning and bringing us presents.
You'd better get all the work _________ before you leave.