Historically, ______ main material for making tables has been wood, but ______ metal and stone have also been used.
| A．the; / | B．/; / | C．the; the | D．/; the |
He told me that he had two girl-friends, and neither of _______ knew anything about the other.
| A．them | B．whom | C．which | D．who |
All of the flowers now raised here have developed from those _____ in the forest.
| A．once they grew | B．they grew once | C．that once grew | D．once grew |
The modern history of Italy dates from 1860, ______ the country became united.
| A．when | B．if | C．since | D．until |
We will be shown around the city： schools, museums, and some other places, _______ other visitors seldom go.
| A．what | B．which | C．where | D．when |
The old building, behind _______ was a famous church, was _______ we used to work.
| A．that, the place | B．it, the place | C．which, where | D．what, where |