I would be happier if you did more studying while you are free, but you ___________.
He told me that he had two girl-friends, and neither of _______ knew anything about the other.
He told me that he had two girl-friends, neither of _______ knew anything about the other.
He asked a lot of questions, and none of ______ was easy to answer.
He asked a lot of questions, none of ______ was easy to answer.
6. He had thousands of students, many of ______ gained great success in their own field.