1 . Lincoln gave them a new vision of ________ the United States of America should be, ________ on the ideals ________ down by its Founding Fathers 87 years before.

A．which; based; setting	B．where; basing; set
C．what; based; set	D．where; basing; setting

2 . Let’s show our sincere respect for doctors, nurses, volunteers or anyone ________ in fighting against the epidemic.

A．involving	B．having been involved
C．involved	D．having involved

3 . The fitness room ________ last year is the biggest one in my city, but I ________ to since I ________ ill.

A．being built: haven't been; had been	B．having being built; hadn't been; was
C．built; haven't been; was	D．built; hadn't been; had been

4 . It can be hard for you to imagine what trouble I have had _______ the problems _______ in the meeting held last week.

A．to deal with; refer to	B．dealing with; referring to
C．dealing with; referred to	D．to deal with; referred to