1 . She showed the visitors around the museum, ________ construction had taken more than three years. （用适当的词填空）

2 . Dr. Rowan, ______ secretary resigned two weeks ago, has had to do all his own typing.

A．whose

B．of whom

C．of which

D．which

3 . In 1963 the UN set up the World Food Program, one of ________ purposes is to relieve worldwide starvation.

A．which	B．it’s
C．whose	D．whom

4 . My eldest son, ________ work takes him all over the world, is in New York at the moment.

A．that

B．whose

C．his

D．who