—When did you go to the United States?
-- I remember _______ there when I was ten.
| A．having taken | B．to be taken | C．being taken | D．to take |
Her sons, both of ______ work abroad, will come back home this summer.
| A．that | B．who | C．them | D．whom |
George, with _______ I played tennis on Sundays, was a warm-hearted person.
| A．that | B．him | C．them | D．whom |
（3） This I did at nine o’clock, after _______ I sat reading the paper.
| A．that | B．it | C．them | D．which |
Ashdown forest, through _______ we’ll be driving, isn’t a forest any longer.
| A．that | B．it | C．them | D．which |
His house, for _______ he paid $10, 000, is now worth $50, 000.
| A．that | B．it | C．them | D．which |