--Mary's gone out with ________ his name--you know, the boy with the red car? -- Oh, it's Jack.
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.
I met the fruit-pickers, several of _______ were still university students.
Her sons, both of ______ work abroad, will come back home this summer.
George, with _______ I played tennis on Sundays, was a warm-hearted person.